Hi Turbosleep,
I have some very basic replies:
-- the "big rack / small rack" setup IMO works really well. Big rack gives big possibilities; small rack is portable and helps focus. I've heard a bunch of other people (incl. working musicians) take a similar approach. So you have a lot of company in this line of thinking.
-- that said, the 104hp setup above MAY be too confining? For me a 9U 84HP setup (Deopfer case) is very portable, small enough to be focused, but big enough to give some room for a variety of modules. Your question about Sarajewo and "hard to justify the space in such a tight setup" may indicate your build would be better served with a bigger case? Hence if you haven't already committed to a case, I suggest you view more other small to mid-size builds to try to zero in on sizing that gives the right balance of small yet inspiring for you.
Good luck!
Nicholas