I finished fabricating the seat backs. I still need to drill all the holes out to #30, but at least all of the fabrication is done. My son just had to try it out.
I had to increase the angle of the bend for the upper seat adjustment mechanism so that it would slip into either of the slots in the upper seat support. Here you can see the two different adjustment positions. The seats can also be leaned all the way back so that the seats simply rest against the upper seat support.
I was not comfortable that the Dynon oil temperature sensor had no provision for safety wiring it to prevent it from backing out. I purchased this tool to drill a hole in the sensor. The sensor fits inside and is clamped in place with the black bolt on the right. I drill is then run through the small hole on the top (the one surrounded by metal chips).
Here is the oil temp sensor fully torqued down and safety wired
