Master. it's quite easy. First you got to score a couple of bearing hangers off a rear swing arm that will match your originals then 3 pieces of steel plate make the box, two sides and a top. heights are determined by the length of the hanger , width is determined by axle length and hub. The box is measured so it supports out to the rear hubs. sides are notched under side rail. top plate overlaps rail. Weld the box up square with the hanger then notch and fit to rail. Install bearings on all hangers and use axle to get the box positioned and aligned with the original hangers
J-man, I think I took approx.. 9" out of the width. this left 16" between the front rail for foot/pedal room and just enough at the rear to still use the stock swing arm and shock upright mount. The width,to me is just right. I'm very comfortable in the seat. not crowded in the cage good elbow room and easy to get in/out of.
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