You are doing those older Tamiya figures justice!

I assume they will be running over some sort of terrain and not just a plain wooden base?

Too easy to work some dirt/grass under the foot to hide any posts in the feet.

Although...the hot glue might work also, only thing is, if the hot glue peels up, it is probably going to take a chunk of terrain with it.

That is what I love about armor. Mess something up, cover it with a pack, box, or mud, and no one knows the difference! LOL