I just had a look, and both the new A1200 and upcoming A500 cases were done on KickStarter.
I'd heard the moulds had been found too, but the A1200 case kickstarter raised €156,310 and produced new moulds weighing in at around 6 tons as far as I can tell.
It's not an inexpensive item, the cases are around €80, so you'd need to make sure you really wanted one.
Also, you'd perhaps want some tweaks like the A1200 case to allow for easy mounting of Goteks or original drives, and maybe CF or SD card openings, and perhaps a case with removeable cover that works for ST and STE.
A pretty big undertaking if you wanted to go ahead.
Collector of old Atari things:
800XL + Ultimate 1MB, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k +APE Warp) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg), 1040STF long button floppy, 2x 1040 STFMs + Gotek, 2x 4160STE with 32Mhz booster, ROM switcher, Mega ST1, Mega ST4, not to mention various bare ST boards for testing including a PAK 68/2
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...