The tank can currently hold up to three people. There’s not a third seat. First, an infantry could take the 3rd seat to get out and support tank when xenos attack it alone. But also it could allow for an MT to ride along to do repairs/cade fixes/wall removal. I tried loading up an office chair but that just gets flipped around.
On the same note, MT can’t install Tank parts; they can uninstall and repair but not reinstall. No need to bar engies/MTs from reinstalling if it ever comes up, it’s not like they’re driving it or something.
Add a window to look outside the tank if you’re the 3rd person. I don’t mind being a ridealong MT for repairs and clearing a path- there’s a certain logistical fun to it, but even I have limits and it’s TERRIBLE not being able to see outside the whole time.
make a dedicated tank crew chief role equivalent to DCC in skills, give them a cupola/panoramic area to view out around the tank and direct the driver and gunner
Bring the APC back, get rid of its guns, and give a hole in the top marines can stand out of and shoot from, and allow M56D to be installable/rotatable