cutting tools. for doors and whatnot

i looked for the tri what ever cutting tools by hasag whatever on the hoddylink japan website, and all i found were hoddy knives. what is the best thing to use for cutting doors out and separating fenders and whatnot? links would be a big help also, because i can never find anything.

My tutorial here - http://www.briansmodelcars.com/tutorials/index.asp

sweet tutorial Fly!