[G] TvZ Mech Play Timing Push

The build starts with factory/reactor expand, something common, bringing its flaws/advantages already known.
The idea is to show to the zerg standard play, and surprise him with tight timing and BFH
Map control is quite easy to take with the helions, with active scouting you can take your expand quickly and safe
This push really punishes greedy zerg/teching zerg, hitting before muta/infestors, and with proper control you can save enough units to deal with them in the zerg base
You don't have to deal with speedbanes neither, and 2 bases bling allin are easy to handle with the helions
At home, it targets the late game, with double armory/third expand quite early, and you have the time to react to the zerg's tech choice (except drop, but if he has search it before the push you kill him before it finishes)
Great against ling/bling
Needs adjustement against roaches

Constant Svc/Supply production as needed
10 supply
12 rax
13 extractor
15 orbital command
16 supply
2 - 3 marines
18 factory (@100gaz)
19 reactor (@50gaz)
20 command center (@400 minerals)
22 second extractor
22 supply
2 helions
27 second factory
29 tech lab on the barrack
Switch with the factory as soon as the third helion is out, begin harass
Constant marine production
Produce in this order:
2 tanks, Blue flames upgrades, constant helion production, siege mode upgrade
Push towards the zerg base at the 8 minutes mark with 2 tanks, 5 - 8 helions (if the first three are alive) ~~ 10 marines and 2 svc on auto repair
Rally the helion production on the tanks,
Keep a scout near the zerg base to stop creep spread

Variation:
If you scout/feel that the zerg is going roaches, skip blue flames upgrades, produce 3 tanks before siege mode, do a fourth after and go push at 40/80 siege mode tech
You'll need more svc to be efficient, siege wisely
Drop play:
At this stage of the game (only 2 gaz), it's really penalizing to seek another tech, so it's possible to do elevator drop play with helions and marine while taking a third, but it doesn't blend that much with mech play from my point of view
Still possible, so i'll add replay picturing it

Early pressure:

Going with 2 - 3 marine, faking a bunker rush ಠ_ಠ

Early pressure from the zerg:

There's some option that the z has, most of them are bad and easy to deal with
If you don't see an expo/delayed one, put a bunker one bloc away of your supply, keep your units at home, 1 - 2 svc near the supply-bunker in auto repair
Baneling bust: Easy to deal with, proper macro with helions is needed, the bunker keep the marine alive
Roach Rush (+ sling): Definitely the most threatening one, but with enough svc to keep the bunker and supply alive (so the roaches can't hit the bunker), you're ahead as long as you took these precautions
I won several games being roach busted (without scouting it), with svc loss

Pressure after hatch first:

As you have map control with the helions, you can see it coming, it's key to keep these helions alive
Roaches bust: Not viable, the tanks will be out in time, really easy to micro when they're out of their creep. Keep the build order, it's standard to transition into mass sling right after that
Mass sling: A wall of supply with one bunker is needed, and good helions control
2 base banelings bust: looks ok to deal with before blue flames, easy once they're done

Similar push timing:

While moving, put your helions in a different group and clean the towers, if the zerg tries to be aggressiv, you should see it
Off creep, as long as you're keeping your units together, you'll be ahead

Constant svc production, constant helion production, constant supply production
At home you need to
Put an ebay
Double extrator at the expand
Double armory
produce a second reactor on the rax
Add a third factory on the vacant reactor
If you see spire, add 2 - 3 turrets per expand to be totally safe, produce thors
If you see roaches, stop helion production, do a wall of supply with one bunker, keep in mind to place your tanks out of their range, turret at the entrance of your base
If you see infestor pit, you should have already won the game :o). turret at the entrance of your base
Launch third CC inbase

You'll hear and read a lot of things about Mech play, the main thing is its supposed slowness
I RESPECTFULLY DISAGREE WITH THAT
What are the cores of your army ? Thors and tanks
Tank is the core army of marine tank, Medivacs and marines allow some shenanigans (but the same can be applied for Mech play, you'll just need to add medivac to your composition which can be more helpful than expected)
Thors is 1.88 speed, Tanks is 2.25, it's 17%slower
BUT
Mutas can't be boxed, and Thors have greater range. With proper home defense you don't fear muta
If he has high muta count, so do you with thors, go kill him
Thors with 2 attack upgrade 2 shot mutas
You don't have to leapfrog, you can a-move behing the minerals of your opponent's main base, it's that APM-dependant
Helions helps you deal with slings runby
It's really difficult for the zerg to do roaches runby, and this kind of move is more of a suicide than the sling/muta is
Plus, there's banshee to prevent this kind of thing
A choice I make is not to do planetary fortress, you don't have to fear sling runby and PF is not so good against roaches)
One bunker with marine + turret help against infestors-muta
Map control - with helions, regular scan are needed to adapt your production to the zerg's
Keeping the upgrades running is the KEY point of this build, because thor is imba, but 3/3 thors are insane

Infestors - Regular comp with roaches: dealable with high tank count, but you really need to do good scouting to prevent bad positioning
Heavy infestors play - with sling, eventually broods/ultra: Ghosts: Emp the infestors, snipe the broods/ultra, ???, profit
Broodlords: Useless against 3/3 thors, they can't be upgraded as much as your army is

Here are some replays

Against top 16 gm

Against Roach play

Infestors play

Infestors/Ultra play

Masse speedlings

French:http://www.youtube.com/watch?v=uoZqS9q4c50
Engrish:http://www.youtube.com/watch?v=dstYF2IyQe0