The whole reason I built the i3v was to prototype a case for a GameCube portable my son and I (aka, just me) are working on...

Using SketchUp, I modeled all the interior components, then "assembled" them:
gc_case_007_PROTO_002_a.jpg
gc_case_007_PROTO_002_b.jpg
gc_case_007_PROTO_002_c.jpg
gc_case_007_PROTO_002_d.jpg
gc_case_007_PROTO_002_e.jpg

...then, from there, I create "isolators" for each component so that I can enclose them. It's an iterative process: measure, design, print, adjust, repeat...

Once each of those it fitted properly, I then blend them together in individual "stacks" so that an "upper half" and a "lower half" of the whole case can be created... eventually. I'm not there just yet.