How many VMUs can you put in a UGC, that has had all of it's tabs removed?
I'd check for myself, but I sold all of my VMUs last year.
I will pick some more up when it comes time to make cases for the VMUs.

I'll also make some cases for the Dreamcast Jump Pack Rumble Thing.
Speaking of VMUs, did you know that USA Citizens can buy Energizer Brand CR 2032 Batteries,
Online, In Bulk, For Cheap, at Digi-Key?
There's some other places that do that too, but I can't recall their names...
Yeah, I'm going to keep the Colors Options rather limited, at least until after I can build a 2 or 3 story warehouse...

I may have to have the Master Molds, of all of my Game Case Designs, up and running, before I can offer any color options.
I will look in to doing limited runs, every so often, for certain Colored Cases though.
If I set up a pre-order system, it could work out in the short-term.
I might be able to still qualify for the lower pricing of a large run, for a short run of colored cases,
if I ask them to make X number of colored cases at the end of a main run of 100K+ cases.
I'll have to ask about that, once I pick an Injection Molding company.
Since they'll already have the huge, heavy mold in place in the machine, at the end of the standard run,
it should be fast and easy to switch from one color to another.
Lemme put it this way...
I've been on some tours of Injection Molding companies, and some of them volunteered the option to switch to other colors on the fly,
for no additional fee.

However, Storage Space and Demand may present an issue (in the short-term).