I would add a new rear cross tube to mount to if you go with a swingarm. When i used the stock 1" box tubing with a more rigid, less sloppy pivot setup, the swingarm twisted the tubing pretty easily. (1st or 2nd page of my yerf upgrade thread shows the setup i did with the stock tubing)
I'd go with 1.5 box or round.
don't know if you've got the means to do much traveling, but i have a complete GY6 swingarm setup. It's from the Sunl, actually a very nice strong piece with axle, sprocket and brake calipers.
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