Impressive. I have a garage, a welder, and lotsa tools and it still would have taken me months to finish something like that...
That said, I think you will probably want to weld the rear engine mount sooner rather than later, and also make some bushings where the swing arm bolt goes through even if it's just a whole ton of washers stacked on the bolt. Can't wait for the ride report!
Did you ever tear the old engine down to see if the cdi/coil was the cause of it melting?