mx500

Cool forum. Just found it. I have a couple MX500 's that my son and I want to work on. I have read through the posts a little and will read some more. THinking about using a 1000w and maybe 4 batteries. I have a welder and can weld. Is there anyone with some plans and list of materials for doing this? I think it would all be here somewhere within the post, so that's one way. Just thought I'd ask if there was an easier way. Also, I saw a site called TNC mentioned....is that the best way to find parts?
My plan is a 48v 50A controller, 4 new 12v batt, 1000w motor, and a new twist throttle for 48v.

Thanks so much.