This project looks amazing. Do you have any idea of a price that you would like to get for selling such a kit? Also, with any kind of fittings, is there any probability of them getting loose?

The price of the kit will be around 17.000 USD depending on controller and battery capacity choices without installation.
Now that i left my full time job to continue with this project i can travel to make the modifications by myself.

The fastening part of the fittings will be at plain sight. So if you check out them time to time there must be no problems.