If you don't care about the size of the knobs, clones of Marbles and Rings will save some rack space. The Batumi always needs the 3HP Poti expander.
The 1010 Music FX Box will also run the two other firmwares, so you have another synth and a drum module there as well (just only one at a time). I'm not sure why you have all of those mults. Maybe one buffered mult. But passive mults are a real waste in a small space. Apart from the convenience, you're better off with external splitters.