Post

phase 1:
case size good
uZeus power not so good - it can be noisy and -ve rail is poor and it is a rack wart (takes up valuable hp needlessly)
get a mantis - the studio bus is significantly better or if you are stuck on the unpowered case then befaco excalibus is excellent - quiet and no rack wart!

wouldn't recommend a free running lfo - I'd rather have a function generator - maths would be perfect - also because it's a great learning module due to the 'maths illustrated supplement' - and it can be free running as well as triggered gated

if you want to process a guitar or other external instrument - I would recommend getting at least a module that includes an envelope follower early - so maybe an instrument interface - again possibly befaco or doepfer

phase 2: how are you listening to the output of beads in phase 1 - unless you need headphones etc in rack then I wouldn't bother with the xoh - I'd prioritize a triple or quad cascading vca - happy nerding 3*vca or mutable instruments veils - veils would be my choice as each channel can also be used as an instrument interface (20db+ gain!)

tbh I would combine phase 1 and 2 - and add a disting mk4 - this has an algorithm for envelope and pitch following - dump the ochd and xoh and add maths and the cascading vca

this would mean that your phase 1-2 would be:
case, beads, maths, veils, disting mk4, sbg - and some stackcables

phase 3: seems ok

phase 4: plaits is a reasonably solid choice - you'll need an end of chain mixer though - depending on how you are intending on listening
I'd recommend the tesseract tex-mix as it is expandable I'd start with a master section and 4 stereo channels

expansion - if it was me I'd add a filter (possibly stereo), an effects module (I like fx aid xl) and more utilities (think plumbing), maybe put the ochd back in