Mounting Seat

[Groovy Cucumber]

Whats up guys, I have been creeping pretty hard on this forum since I first got my Geez about 4 months ago. I pretty much figured it was time to get in on the fun.
So what I'm trying to figure out is how to mount my homemade seat onto the geezer, I do not have a back fender on it if that makes a difference. The seat is pretty much rigged up from scratch as most of my whole "cafe" type conversion is. What I did is I took the last 6-10 inches of skateboard, and cut that off with a jigsaw. Ripped the griptape off then sanded it down so everything was smooth. Then I went up to walmart, got some normal foam, and stapled that down on top. Yesterday I went up to Joanns Fabric, and got some black vinyl. Today I hope to wrap the vinyl around the top of the skateboard deck and staple it down on the underside.
If anyone has any way i can mount this down onto my bike that would be great and all suggestions are welcome. I obviously want to be able to remove the seat without damaging it to access my electrical. I'm really on a budget and this is my first bike so try not to make any ideas too complicated. Thanks