Welcome to the forum.
Buy a Can-am or Polaris.
Sorry to be blunt but if your asking these questions you have no clue.
Some of our karts might make 40mph and we've done some hefty mods.
Another thing, it's way easier to buy a running kart and do a little work to it than just start from scratch. Especially if your not already set up to build such things.
We're here to help but what you ask is alot on your end.
---------- Post added at 09:04 PM ---------- Previous post was at 09:02 PM ----------
It's also not a good idea to use your email as a screen name. You just might get a ton of email or hacked even.