The Format .ODF I believe is the individual ship table. Instead of one huge table each ship has it's own entry (called an ODF file) text format.
The actual MODEL is in SOD format I think GMAX, 3DS (since it's not free I don't have that)... Some Unwrappers and Milkshake support SOD format. Main problem is getting SODS exported to .cobs!! I have never gotted an Armada2 ship into freespae except for the ones Little Ludi converted over at Freespace2Sector (bless his German Heart!). There is a completed Homeworld FS2 mod... (I kept the Hades for a low poly long range view that actually uses a model) so I can make a scene of mass Hades Destruction without taxking my system greatly!
Forgot URL but off main homeworld site it is JTS online try RELIC (UK) board... As for solid snake I chatted with him a little over at ArmadaII files.com and SGN, Seems like an interesting project, but I'm all RTS-outted. Once I finish ArmadaII I won't be modding it, Like I retired BOTF, I played all the races and then added the dominion mod and played them all again to beat the dominion and retired my CD's... FS2 Forever! (ok maybe not , but definately for a loooooong time still!)