Hi there,
I'm about to attempt a Common Lisp implementation of Cap'n Proto. I was planning to start with serialization and then, provided it goes well, move on to RPC. My idea is to first gain a deeper understanding of the schema language by thoroughly reading the docs and then start hacking, probably looking at other folks' implementations along the way. I don't yet have a clear picture of the amount of work needed, but I wanted to make a sort of commitment to at least spend some time and effort on this project.
Regards,
Wojtek