Project is technically interesting. But be careful with the author. He has some serious mental issues. He is religious fanatic, CIA conspiracist, racist, and cannot listen to any constructive criticism when somebody is commenting on his TempleOS.
Here's what author is writing:
https://twitter.com/TempleOS
https://news.ycombinator.com/item?id=11554821 (you need to login to HN to see dead comments)
https://news.ycombinator.com/item?id=11517726
https://news.ycombinator.com/item?id=11554821
He's been banned multiple times from various tech sites (HN,
gamedev.net, etc..) for his language.
Another good handmade OS would be MenuetOS:
http://www.menuetos.net/