There's this old game called battletech. It is played on a hex borad, like massive assault. There is terrain included. Were it possible to rewrite the rules, one could make a mod for the game that turned it into classic BT. The rules for BT are more complex than MA, granted, but with some work, a CBT clone could be made.

For that matter, ever heard of Mechwarrior Dark Age?
That is a fun game!