Very impressive constructional talents!
Without wading back through 70 pages of details, may I ask why the drive-chain tensioner? I see you've retained the slotted swingarm with the diabolical bit of tin to locate the axle rather than go to a fixed rear wheel position. A custom chain tensioner should avoid all risk of damaging the gearbox bearings by having the chain over-tightened, but a modicum of chain-slack works for most of us!
Nick
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