Same problem you have with most custom solutions. The people this is for prioritize other aspects than home reparability. You could do what I do when I buy a custom item that I know has specific failure modes, buy the replacement parts in advance and store them. When I had a Mitsubishi 3000GT VR4 Spyder after the first roof retraction failure and trouble finding parts to repair it, I bought several of the most likely failure points parts and put them in storage. Then when it failed again, I had the failed parts rebuilt and put back in storage. It was not perfect, I still had to have custom built components machined to replace some parts I did not see as failure points. But it kept the car running and for a significantly lower cost than it would have otherwise been if I had been buying those parts at the times of the failure as they simply were not available anymore.