The only difference is the weight (and X60 is .2mm taller than T60). Really not sure if I should add the weight - if I do, I wouldn't be able to have it identical because of the central tray mounting point... So any advice, please weigh in! T60 is being prototyped at the minute, so waiting on the sample before I go any further. I'm also not sure if I'll do a GB or just drop some on my webstore (when it's up) as an initial debut, but they will be available all times.
Having thought about it a bit more, I'm no longer sure whether the T60 should have the weight.
Weight w/ no post: Having the weight would carry over nicely from the X60, but without the centre post, typing feel on some boards will suffer. Not too certain what exactly causes this disparity between different boards, since my PCBs are about the same thickness, and my plates are technically all aluminium; the GH60 does fine without a centre post, but B.face feels horrible, and GH60 satan is somewhere in between.
No weight: the case obviously loses the uniqueness factor, but as a hipro case with a thick base, it should already be plenty hefty.
Split weight: If prototyping a new, split weight will push the price towards $300, the prospect becomes less appealing.