probably don't need the quantizer - all the 3 methods you have of generating pitch are already quantized
do you need 3 ways of playing?
the midi module - lots of people on here saying it's a pain to get working - look for something else with better user reviews - Mutant Brain perhaps if you can find one
swap the xoh for the alm version - 2hp!!!
do you really need an auto tuner - it will only work for 2 modules - probably better to get an actual tuner (pedal or app) and learn to use that!
get stackcables or headphone splitters instead of the mult
the amplifier seems redundant - veils has plenty of gain (over 20db)
the delay is massive in this size case - maybe look at a fx aid xl? more options, much smaller!!
with the extra space freed up I would look at getting rid of the pico modules - and replacing with at least a decent sized filter
"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia
Utility modules are the dull polish that makes the shiny modules actually shine!!!
sound sources < sound modifiers < modulation sources < utilities