eBay Motors: mini dunebuggy dune buggy sandrail sand rail frame (item 330298672688 end time Jan-11-09 12:36:55 PST)
I have seen that frame talked about on here before. $800 "might" get you the frame. Do you live close enough to go pick it up? Shipping that will be $250.00 minimum and likley FAR more.
Heres the problem with that or any other frame you may buy. Is the suspension and geometry done right so that it handles well (and safely!!!) and is there enough room for YOUR motor? How about enough room for you???
It does not look like the suspension mounts are quite done yet in that frame so you may be able to do those to your liking some but then the suspension arms with it may not work.
Its hard to start at the wheels and build in with a premade frame. BUT it CAN be done. Many have bought premade frames and made nice buggies out of them. You need to understand what you getting into and only YOU can honestly answer that you know what you need to know to build a complete unit.
You NEED to be able to put the seat(s) in it you will sit and have it at the angle you wish it to be AND then still have enough head clearance (Should be a MINIMUM of four inches from your helmet to the top bars. 6 inches is prefferred. (Yah I said helmet.) Between potential frame bending in a hard impact and the stretching your neck will do you do NOT want contact at those impact levels. Necks can stretch a few inches if the impact is hard. The tiny amount of extra tube and small weight gain above your head is far better than neck or skull injuries. How tall of a person is that frame on evilbay made for? With what seat? Was it built right? Did the person make it only so tall for looks and not safety? Is there enough leg room for one? For two???
This is only a couple points of many that need to be answered.