There is more progress to report on the gaming table in today's posting.
This particular hill was going to be a Deff Dred wreck (shown below). But the problem was that the dred was too heavy for PVA to hold it down. any other glue will melt the foam. The new plan is to glue the Deff Dred to a piece of plasticard, then glue foam around the wreck.
The next stage of terrain is to finish sanding it, paint it, and hopefully get some more usable buildings bought and made.