We will be driving an old RX7 in the '24 hours of Lemons' this year. Looking forward to pushing it in a nice casual race. Mechanically, we were not at a point where it was solid enough for 2022. I think the rotary engine was the only thing that was working. :)
I guess you already seen it, but for anyone who shouts at Wankel engine unreliability, small plug for Rob Dahm and his video about fixing that engine biggest problems: https://www.youtube.com/watch?v=BwM6JJYPzkM
Good luck with the seals! Between rotary and Stirling I find it hard to pick a favorite and both of them have similar problems despite the completely different geometry.