Boom here you go, I thought I had saved e thread. It's a really good walk through, just read it a few times before jumping in and you'll have that ugly silver can covered up in no time.
http://rctruckandconstruction.com/showthread.php?t=2621
Also 3000toys.com normally has the engine in stock at a super awesome price. I purchased a few from them and have always had good dealings.....
http://www.3000toys.com/catalog/item...9#.UXCSm8u9KK0
Good luck with the build and post some pics when you get going at it.
--Dan