Hey SeamusG,
Hard to add much to Ed's stuff, he is good. Any how good luck with the glider build. Almost all the woodies can be modified to electric. For slope foam is nice do to the rocks etc.
I have an eye on some smallish slopers do the the smallish slopes in the midwest.
Blue Fan Fold Foam or depapered Handi-board for material so I can remake it as needed.
There are just to many free plans around for foamies to be any more specific. (That means I haven't picked one yet)
It would be easy to tag a small motor onto any of them as well.