I think you've already pinpointed the concern I would have with this rack: the layout and cable management.
I would probably group this by function, i.e. all oscillators/sound modules together at the top, then filters and effects, then modulation, and all sequencing and mixing at the bottom, with sub-mixers and mults interspersed throughout.
Your rack may be a little voice heavy, but unless you feel like you could use more VCAs or a 3xMIA or something like that, I don't see much trouble with your module choices.
Have fun and good luck!