Shrink me down and I could live there! well, if it wasn't for the morbid odors and mannerisms springing forth from the battlelore personalities, and of course the constant bloodshed among other things......... .
That would be nice and light. The river is styrofoam too? Anytime I cut stryofoam I just make a mess.
4.5 volt battery, two wooden sticks, wire in whatever shape.
(Guess to make a river you may want something not straight and maybe you need a thicker wire then to hold the shape and maybe then the battery power isn't enough? Maybe you could stabilize a thinner wire someway else or kinda make it tea spoon sized and take away a small piece each time.)
(I suppose it work with 9 volt to. I've just only seen 4.5 .. , serial connected 1.5 volt batteries should work to I suppose.)
(Edit: Looks like tiles. I was thinking something more permanent , anyway, could probably be used for the hills or a river tile in styrofoam.)