Not too much has been going on lately with this. I've been thinking about how I want to attach it to the car and keep it easily removable. I liked the idea of some form of plastic clip and when I went to the store I talked with one of the clerks there and he recommended those spring loaded cabinet catches. I picked up four of them.
Now, I'm just trying to figure out how I'm going to attach it to the block and to the grill area. I'll probably use wood blocks on the car side and probably even wood blocks on the grill block. I'll definitely remove the foam on the back and add some additional fiberglass to the back side of the block to beef it up so it doesn't crack under the stress of installation and removal. I'll probably imbed the wood blocks in the fiberglass to strengthen the whole thing and just screw the catch parts to that.