Generally, from what I understand, street legal means that it still has the brakes it started with and the rollcage hasn't changed. Also it has seatbelts. You c

Generally, from what I understand, street legal means that it still has the brakes it started with and the rollcage hasn't changed. Also it has seatbelts. You can pretty much do anything to a car after that. Technically all welds have to be done by a certified welder. Apparently the trick, if you are starting from scratch, is that you go to the engineer at the state troopers for your state who would approve the design before you start. Or you just start with a VIN'd frame and then you don't even really change anything. If the engineer doesn't seem down, try and find another. If you can't find one maybe you should move because you're not going to get it road leagal very easily otherwise. Source: Looked up how to do it when taking a fab shop class at a tech college in WA last year. Asked the interent and the fab shop teacher (who had built several motorcycles from scratch).