gocart building

[greencactus3]

well i used the search function and got nothing. either noone has made a thread on homemade gocarts, or im useless with the search thingy.

so, who here has made gokarts before? as in nonkit ones. well im basically planning to create a couple with friends, and was wondering where to start. i know honda engines are nice and reliable. my budget would be hopefully under $500 (for 1 gokart) we wanna make one for each person.
and been looking on ebay and such. engines for 200ish brand new. OR a brand new 47cc pocket rocket for like 200 or less shipped. defitniyl a pocket rocket would be nice as it already has a tranny, disk brakes, etc we can salvage. but the engine manufacturer isnt listed. nor the specs. it just says, it goes up to 35 or so mph. *depending on conditions* lol. does an extreme downhill and backwind count in those "conditions"? well bought,traded, sold many things over the internet with no problems at all but how is ebay? or is that too general?

what are some points to look at when building a gocart or even getting the supplies? just tell me everything i might wanna know. hopefully im gonna get a lot of input here thanks.