have a read of this one (
http://www.locost7.info/locost.php) im currently attempting to build a marlin berlinetta, but at times wished id just got a referb to do, the full build of mine will far out way the cost you can get one ready done , if!! your on a tight budget buy secondhand and modify it to suit your self. it will dispel the self build achievement, unless you do some thing really radical with your purchase