the simplest solution to me is:
take the clep diaz out in the short term & buy another case... and put clep diaz in it...
or better yet... put a decent handful of modules in it and get some blind panels...
similar to @nickgreenbergs solution - but you still get to keep all your cases - so you can have one or 2 that you can pull out
given the number of voices you have it would make sense to rationalize quantization across them - can't recommend the sinfonion enough for this...
I find separate cases easy to deal with - I have 6 and will add 2 more (well 2 * 6u/84 hp in 2 6u desktop racks)
I like this solution as it is easier to deal with individual cases on a power and maintenance level and I can have a couple that I can pull out for whatever reason to use standalone - 1 for audio, 1 for video, in my case!
"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