SamHThere is a TEX aluminum case that fits Filco TKL keyboards. I have a gray one and it is nice. I'm looking to get a second black one but it is out of stock at mechanical keyboards.com so I am waiting for there to be a group buy here.
CommonCurtactually they already did once, and the price is surprisingly high (around $300 if i'm not wrong)... and they wouldn't make any more TKL case for Filco (confirmed by Feng of GeekKeys) and started making their own aluminum keyboards, starting with the GeekKey 87-A. (was also run on MD)