Finally finished what I suppose I would call, the cheapest thing I could build that can actually move me. I will include a list of parts, but this is what you can call, on a serious budget. I am only 15, like probably a few others, so I don’t have an income to afford dual 6364’s. 
Specs time!
Specs: Kryptonics 27" Cruiser Skateboard (So Bad) $35 SK3 350kv 42mm Motor: $37 Hobbyking 70A ESC: $32 Turnigy 5000mah 5S 20C: $42 IMAX Charger: $20 2.4Ghz Chinese Remote: $16 Pulley/Belt: $10 That totals $150, but that isn’t including shipping and tiny things like the deans connectors, so I rounded to $180. Pictures:
The motor mount was tough, had to file down the trucks and come up with a 3d printed one. The enclosure, wheel pulley, and mount, were all designed and printed by me in PETG. Although now, I converted my 3d printer to a cnc router, so pretty soon I will be selling motor mounts. 
HTD5M 15mm wide, a little too wide most would say. I run it rather loose so the drag isn’t unbearable.
The top speed is about 12-13mph, not too sluggish. The pulley is a 10t, and the wheel spur is 31t. The wheels are only 57mm, a little too small for my liking. It has a surplus of torque, it may even be geared too low. It barely bogs down on really steep hills, so I am satisfied. Range is about 4-8 miles depending how I ride. For $180ish dollars, I like it
Motor gets a little on the warmer side, but that is good. It is running at close to its peak efficiency. Any higher gearing and it will struggle, any lower and it won’t be pulling as much amps as it could be.
I want to build another board if I got the funds, this thing is what most would call underpowered. It is more of a toy, but still is fun regardless. If it had bigger 83mm wheels It would be a lot more feasible since small rocks rattle this thing around.
