It’s a brand new MSI Cubi NUC 1M. I suspect it may just be too new as it looks like the graphics may not be supported in the current installer. I had already been considering whether to build it manually anyway but wanted to have a look at StartOS.

I’ll definitely check out those videos. I’ve been roughly basing the install so far on the RaspiBolt guides and changing to x86_64 instead of arm since I’m using a NUC instead of Raspberry Pi.
https://raspibolt.org