JSCRAPER, I started building one a few years ago and decided on an 1/8 scale version since I wanted to run a large motor. Didnt want to come up short on power at the end. Youre going to come across some challenges while building it but just work thru them and you should be alright. Honestly, I built mines without many people knowing to keep foreign influences from hampering me and thats the biggest challenge. I say go for it and build it. If you need any info or advice, please dont hesitate to shoot me a PM.
BTW, your best bet is to go with rear exhaust motors. Here's a vid of mines when it was done.
http://www.youtube.com/watch?v=xgTbH...feature=relmfu