Well to eachs own but you can buy blaster frames so cheap. My cr 500 blaster is still rollin strong. Im no pro welder but when your messing with a big bore like the 500. You better have some good strong motor mounts. The vibes are not that bad at all. It only vibes when the motor is not under a load. Im putting a 12 over arm on after christmas and a 25 shot(hill climb style). I'll post some videos and pics when i finish the set up. I like pulling it out when everybody is draging there $ 6000 4 stroke that they just got. They look at the air cooled motor like its nothing. Then leave them at the start line. Lol