I'm still working on it. The wheels are pretty tough to match. The top board piece is pretty easy.
I'm not sure what the piece that's making the spark on the back is.
I DID do a completely non-screen accurate one for my brother for Halloween, which turned out okay.
Here was the situation: my nrother said he's going as 1985 Marty for Halloween. I immediately set out looking for all the proper components (same jeans, same Walkman, etc.).
Me: I've been doing some research and I think you can pull this off for around $250 if we take some time and do this carefully.
Him: I spent $8 at Goodwill this afternoon.
I gotta admit, it looked pretty good....