hi Grey , The tube frame was a whole lot lighter and I had a choice of a removable tanks , plastic even , the design choices were too endless. I also thought of sprocketing another crank in front of the engine to the original crank axle but thought Why am I spending so much time on this thing? After awhile you have this over engineered machine that is unrideable and starts looking funny . After I'm done I'm moving on to the 150cc 4-stroke version. It'll be the tweener bike that isn't quite a scooter and not quite a full sized bike that I can ride in the local scooter club other than my MadAss clone . The Local scooter club guys already talked me into building 5 frames for them so it'll be interesting to see what they come up with . One guy stuck a GY6 engine in his, using a modified rear wheel . He machined the alloy wheel down to the hub and connected a sprocket to the hub. The rear wheel is chain drive BUT no visible brake because the rear brake is in the rear hub and braking is via the chain. The best part is that it's a CVT and twist and go operation. Should be a screamer .