Hover tanks?
Nah.
I have DO... i wonder if there could be a way to mate the two games so that a [portal] (like the warp point) would transfer you to that map type for ground combats. If that was the case, you would be able to have space combat in the SF engine, then ground combat in the DO engine... which would allwo for the creation of multiple cities on any planet... multiple battlescapes... perhaps SF II or SEV could run with this idea...