"no radio/ amp/ speakers, home-brew GT3 center console, 987 aluminum engine cover " I did that stuff too. I used a miata battery for awhile but I kept burning through them and went back to a factory battery. I have a build thread
http://986forum.com/forums/show-tell-gallery/59449-woodys-build-thread.html
You'll have to use google chrome with the photobucket bypass option to view the pictures. I removed the transmissions and motor. I used a rear trunk latch for the clam shell and modified the top motor bracket to hold it. It works great and is one of my favorite modifications.