Freespace Forever is a wonderful idea to begin with. But integrating a Red Faction GeoMOD engine seems to be superfluous. I mean that Red Faction requires AT LEAST 32 megabyte video memory and plenty of V-MEM on your hard drive. Lets keep the new engine's video requirements within 8 megs. of video memory, since Freespace 2 came out a few years ago and some of the people here do not want to buy a new computer jusp to play Freespace Forever. This means NO extremely specialized texture mapping, virtual explosion effects, etc.
What we CAN do is specialize the original engine and integrate some stuff into it such as better POF file support of multiple textures, smooth texturing, better dynamic lighting such as sun glares, animated textures, and much more if you focus on one thing at a time. (This requires maturity.)

Good Luck!