If you were supposed to get an email from the forum but didn't (e.g. to verify your account for registration), email Wes at stararmy@gmail.com or talk to me on Discord for help. Sometimes the server hits our limit of emails we can send per hour.
I plan to develop it further as it gets used ICly. I ended up putting two on the Sakura after the crew had to call for a taxi on Lor. It's based on the German Wiesel (the cutest tank ever).
Whenever I think of a machine cannon, I think of the Phalanx CIWS and its awesomely awesome and intimidating buzzing sound when it fires. I'm not sure how the 35mm machine cannon sounds, but you could pick something that buzzes and is small as the name for the tank. To keep with the Japanese theme of Yamatai, you could call it the "suzumushi."
1.7 and 2.5 meters don't give much room for more then one small person, when you're dealing with a tank Wes. Unless those are then interior dimensions aswell as the space allocated for the tanks engine, gun and misc. systems.