Well there already is a recovery file for the fp1 + fp1u by chrmhoffmann up and running. The MTK6589 source code is kind of released and there has been a lot of work on the android code by the omnirom project, which might come in handy.
Should be definitely manageable to build and try out Firefox OS on the FP1. UnfortunatelyI’ll just don’t have the time to really dig into that. Maybe someone with a bit more experience can give it a shot. I’d love to see and try out the result…