I built something like this: https://rwmj.wordpress.com/2016/04/10/libreboot-on-my-x60s/
I'm glad that a company is stepping up to build these because the situation with libreboot/coreboot is very confusing. I think the projects forked, plus the documentation is terrible.
As an 11 year old, 32 bit laptop it's not for everyone, but the X60s is small, light and rugged — a real classic — the last version that IBM designed before the Thinkpad brand was acquired by Lenovo. The main problem is sourcing batteries.