Another Mantis vote here. Don't start in a single-row skiff, as you'll either...
1) jam it full of tiny modules to the point where you have no room to get your fingers in, or...
2) build 2/3rds of a synth, because that's what you've got usable room for.
Small form factor modules DO have uses...they're not bad for things you don't need to tweak often (if at all) and various utility functions, but as main modules...nuh-uh. Case in point is in the build above: if you're going to be cranking on the VCF's cutoff (a very common technique, particularly if you're working out a "builder" track), you'll be having no fun whatsoever doing that while studiously avoiding the VCO's tune control.