As posted earlier, my 1/72 VSX will be delievered tomorrow

I hope they last longer than the VS*R models did. They sure look a lot better! My plans are to build a 1/72 battlefield, perhaps a sectional type that can be broken down for easy storage/travel for vacations and trips where bringing along the 1/16 is not practical. There is a boatload of 1/72 stuff out there, so It will be a work in progress for awhile. I've built/painted some 1/72 german troops, a kubelwagen, US jeep and kettenkrad to get it started while I was waiting for the tanks.
Anyone have any ideas for what to build the battlefield on? Wood can be drilled and pegged to place back together, but can be heavy. Styrofoam can be easily molded for contours, ravines, creek beds and rivers, but is brittle... any thoughts?
I'll post pictures when I get things going!