It's hard to decide on a ratio since 128x128 is about the same in terms of how many factories you can cram in, but the siege tanks range is far larger compared to the map then than it was in BW. Does one adjust size based on tank range, or buildings, or compromise, and if so, where? What is a good map size for SC2, conversion or not? How does travel time compare on between BW and SC2 on maps that are the same size tilewise?
For some illustration, when my map was 128x128 the main could fit about the same number of factories for example, but the natural was way too small and the command center / harvesters were tankable from outside the walls, which they were not in the original. I bumped the map up to 144x144, which game me enough room to enlarge the naturals so the economy stuff was tank safe (barring tanks rolling in through the choke of course).
Now the formation in the middle was too small compared to the mains+naturals, and felt cramped besides. I bumped the map out to 152x152 and enlarged the middle. Aesthetically I liked it, though 160x160 probably would have been better to keep the mains to middle ratio the same.
So, pics of the map: Wuthering Heights (after discussion in this thread, I made a thread for it here: http://www.teamliquid.net/forum/viewmessage.php?topic_id=153307 )
128x128 conversion, note tanks in shelling distance of natural command centers:
I could expand the naturals without changing map dimensions, but this would encroach on the middle high ground, which is already too small (note how one tank has range all the way across it). Also I want room for units to leave the natural choke without getting shelled by tanks on the high ground, which I couldn't do if the natural were bigger. Or I could enlarge the natural at the expense of the main, but again this underscores how scale is different in SC2
here is the map at 144x144. Natural is now tank safe (even the mining workers. It's very close though). Middle high ground now smaller in comparison:
Middle is now no longer spanned by a single siege tank. Proportionally it should be bigger yet, but it starts to feel way too large. Tanks really have phenomenal range.
So I'd love to hear thoughts about the right size: 1) in general for SC2, 2) as compared to BW originals, and 3) for this map in particular if that isn't too cheeky