I've uploaded some STLs for WWII British cruiser tanks for the desert war in North Africa to Wargaming3d
The Crusader II, with and without the MG sub-turret
https://www.wargaming3d.com/product/a15-crusader-ii/
... and the Crusader III
The models have been created at 1:100 scale for 15mm gaming, but I think they should scale up easily enough. Scaling down might be more problematic, as the 2pdr gun is a very slender item already. For 1:150 or smaller, I would probably just replace it with a short length of wire.
Test Prints and Things
The Crusader II test print was printed horizontally, with the tracks and the base of the turret right on the print-bed. As expected, the very gently sloping upper panels all show a lot of layer lines, but a bit of scraping and judicious painting will minimize those. At tabletop distances, I very much doubt they'd be noticeable in any case.
The Crusader III I split up, fore and aft, both the hull and turret, to print vertically.
This certainly ameliorates the issues with layer lines on the upper panels, though there is a bit of post-print assembly necessary.
The only real issue with this method is that the 6 pounder gun barrel, when printed vertically, was very fragile indeed, and it broke off almost immediately. I replaced it with a new one made from a length of bronze brazing rod. I've done this a lot with metal/resin models, so it's no big deal.
I've since modified the split-turret STL to remove the gun entirely, and to replace it with a socket. That should make adding a metal gun barrel a very simple matter in future.