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It's a shame about the chain and self right, but at least the rest of the build looks great.
For the LinAc, I have been using a free trial program called Mechanical Expressions. It's 2D, and the modelling is done with simple nodes, lines and coordinates. Add a load of 13.6kg, and it'll tell you the force on the LINAC.
If you decide to give it a try and struggle, I can try and lend a hand.
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Back from my holidays and back to the drawing board and time for some reflection.
Lessons:
The scooter motors are too heavy for anything but a push in this class (as I was advised)
Got the electronics working woohoo!
Realised chain drives are a lot tougher to get right than I expected
All the nuts, bolts and washers add up to weigh a lot more than I expected
Due to the number of failings I am going to park this concept and try something new