White or Pink Foam?

[GreenDiesel]

I think what you have is fine - I wouldn't go purchase another piece of foamboard just to replace it.  Wrapping the edges is going to give you a nice way to add a support structure underneath the foam.  Even if you eventually dig into the foam to add some scenic details you can always layer in some plaster cloth and you won't have the white mess to deal with.

Thanks, this is helpful. I plan to carve up some small pieces of pink 2x2 foam on top of it to create 1-2 hills.