That is something I've been thinking about wanting to do since I purchased the two HARP-SF books, but don't currently have the time to spare due to the RMU project I've been writing and other things going on. Would really like to get back into sci-fi gaming at some point in the near future and such a system would be fantastic to have available. Out of all the RPG related activities there are, designing and detailing things is probably my favorite (ships, space stations, castles, forts, cave complexes, cities, mapping wilderness areas, etc.).
It would be really great if something could be developed that can be used with both HARP-SF and a sci-fi version of RMU if/when it comes out, that way future ship and equipment books as well as adventure modules could potentially be produced to work with both systems fairly easily.