Ironically enough, look backwards in the yerf line to the 3203 for design inspiration. You want to build a beefed up version of that swingarm/engine platform. It would be a simple enough project, but I would invest in an Azusa axle, additional axle bearings and beef up the shock mount areas on the main chassis and install better shocks. Likewise up front you should do the normal upgrades to the front be it 420 or 150. It should be a good torquey machine that's relatively simple but will not have reverse. Plenty have used the 420 in other builds and they can be modded for more performance.
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