I have been looking for vehicles (chassis) that are reasonably in scale and can be easily modified to fit the general theme of a vehicle. Recently I picked up a couple of Hotwheel UNSC Scorpion tanks at the local grocery store for four dollars each. I cannot tell what scale it is, other than Hotwheel scale. Used two magnets to attach the turret and a hole punch to make a disc to cover the hole where the mg turret was. Its nothing complicated, but it looks more like the 95 ton tank that it should be.
