@meRichie, your rack above is really interesting in concept and has a lot of modules I would want if I was sample-focused.
I agree with others above on i) your rack design is short on "basic / utilities" modules that will be needed and/or ii) there may be non-modular alternatives that are pretty compelling (especially in the MPC lineup).
IF you want to stick with modular, then I suggest you keep in mind the idea of "balance" of module types and HP. For me, in a small to medium sized rack, I try to keep the balance as follows:
-- 30% or less of HP devoted to voicing, aka "modules that make or change sound"
-- ~30% to CV sources like sequencing, LFOs, envelopes, random/chaos (Sloths) etc.
-- ~30% to utilities (VCAs, attenuverters, mixing attenuverters, mixing, mults, etc.)
--~10% or less of "other" such as finishing FX and in/out
In a huge rack IMO one can get away from the above balance AFTER a good "core" section of CV and utilities is available. In a mid to small rack, I find the balance %s above very important.
My early designs skewed too much to voicing and as a result the rack was very "underpowered." Adjusting the balance towards more CV and utilities gave my rack a lot of depth, e.g. every voicing module I wanted to use had plenty of support that allowed me to explore the range and corners of its capabilities.
Hope this helps, good luck!