Sealed it tonight. Also got a lot of elmers glue.
When I go to put my grasses in do I just drill small holes and glue the grass in there? Then maybe put some dirt over the base of teh grass to cover the hole/glue part a little?
Yes that will work.
I start with plywood, screw down a runner(small 2x2 or 2x4 for larger bases) in order to keep it from warping, foam, rocks, glue, dirt, glue, debris, glue, grass.