I'll agree with @noodle_hut where 2hp modules are used, for sanity and useability I find that a 2hp spacer is needed between other 2hp modules or they need to be placed next to a bigger more finger-friendly modules with more space.

Though as you have no plans to actually construct this you could argue that people have no actual reason to comment on it, what feedback do you actually require?

All your other rack plans(?) are private, could you make public the Racks that you do actually own or plan to build so that people have the opportunity to actually comment on what you do have or will create?