phobos forked Quakespasm for the Oculus Rift and there is heavy development going on at https://github.com/phoboslab/Quakespasm-Rift
Maybe some of you would like to keep an eye on it to make sure the engine is not going into an unique incompatible direction? From what I see they are doing a great job to avoid that but some of you guys have an unmatchable (wow, I am dripping...) lot of experience with Quake engines and could surely support this project.