I picked up the parts today at Home Depot in Chaska, MN. Home Depot staff chopped up the 2x6 for me at the store. I already had the motor, battery, and wire on hand.

I discovered that the 3D model I made for the steel brackets was wrong, so all of the holes are a little wonky. It took me all afternoon to make the first version. Lot's of time trying to find my tools, etc. I did a terrible job drilling holes in the PVC arm. I need to make a jig for it to get it right. Glueing the PVC was also a lot more trouble than expected. Obviously all of the stuff needs to be more carefully cleaned and deburred. This prototype was not quite up to FDA standards, I think, probably.

But, the prototype seemed to work as expected. (See 1 minute video of the action.) I will have to update the 3D model with new brackets. Then I can make pdf files for all of the parts, showing proper drill locations, etc.

Erich Frahm - Shakopee, MN

1 minute video (mp4) from my phone of Prototype V1 running on the moped battery. (Seems to work in Chrome. Firefox, not so much.)

Picture from my phone of Prototype V1 running on the moped battery.

https://www.amazon.com/gp/product/B074KLFNLF

BATTERY TYPE: YTZ7S

12V, 6Ah

Dimensions: (H)4.13" x (L)4.45" x (W)2.76"

This is where I made Prototype V1. (The tailgate of my pickup truck.)