When it comes to tanks, SMALLER is Better. I hunted tanks for years and they bigger they are the easier they are to hit. Something to consider. Golf Cart, 4 wheeler, mini car, Lawnmower. Then I built a tank.
Took smaller to an extreme. I can go through doorways. 30" wide. I built a PUG walking tank. Man Powered tank have one huge advantage.
Many games will allow you to go OFF the tank roads since you won't crunch any bones if you step on someone. So they follow unpredicable routes and can accompany infantry where THEY need to go. The RPG guys have to pursue it instead of napping beside a tank road. Imagine in that picture you are the gunner in a tank. 40-50 yards away. Bit of a small target even totally exposed. Add a 20 inch oak tree and it is half covered. A spool, bunker, etc is good cover.
The secret is the material I make it out of. Polycarbonte twin wall. Very tough, super light. That shell is 22 pounds counting the legs. Add 40 pounds of paintball gear and it is battle ready. That includes a 19 pound, 513 ci x 3000 psi air tank so it can be playable for less than 65 pounds. That runs a 1 rps Autoloading Nerf cannon. Now imagine yourself as a tank gunner in that picture. You are an EASY target. I can get off 6 shots at you before you can reload for your second.
Cheap to build, maintain, and transport. You could be PLAYING in your tank this spring...