Here's how I did mine.
Well, I would try to cut all the stuff out if possible since most of them are all held at some rather noticable and hard-to-re-touch areas.
Tehn I would take those left overs form the trees and glue them onto the pieces. Yup, I GLUED them, at some unoticable areas of course (ie. under side of the seat, under the dash, etc.etc..). And then I secrued them on those bamboo skewers for easy handling and airbrushing. Sometimes when there are holes on the model I would just put the skewer in directly to secure them.
I also used the 'tape method' when there's absolutely no place to glue or hold the piece.
I guess a pic is worth a thousand words. Have a look.
