Try as I may, I can't stop thinking of ways to make this build more complicated for the sake of aesthetics. My original idea was to just shave the top of the seat pole and weld a tank over the frame, but I just didn't like the rake of the fork, nor the seat tube and original top tube interrupting the lines of the overall design. So, in an effort to streamline the design and make my trike look even more chopper-inspired, I removed the seat tube and original top tube, and slanted the headset back a few degrees.
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I'm thinking of adding either a Mattel V-RROOM! motor or a Sears Hot Rod Twin Fire motor to help fill the void, but I don't know the dimensions of either, or how much it'd cost to get one for that matter. I'm hoping someone here or on ratrodbikes.com could answer that for me.
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My biggest concern, however, is how this idea would affect the structural integrity of my trike. I'm hoping my plans to sit over the rear axle, and therefor take most of the weight off the bike frame, plus welding a new solid cantilever-style tank and top tube will help compensate for the lack of a seat tube. I'm no engineer though, so what are your thoughts?