Source SDK (software developer's kit) containts a nifty tool called "hammer"
this tool was used to make almost every map for every source engine game there is.
it's a brush-based geometry tool that it simple to work with and easy to master, and gives great results iwth a little effort.
it also contains a cool little tool called the "propper" it converts brushwork into a model file, that can be used as a physics prop or a static prop. this program also automaticly generates a physics mesh.
I have quite some experiance with this tool, it's not very good for curves (like a chassis of a ship, but it with effort you could make it, angular ships like the waran on the other hand would be a cinch) but for things like stations it would be ideal.
There is a problem, however, I'm not quite sure what model format Freelancer uses, but upon running the program it makes a .DX80, a .DX90, a .MDL, a .PHY, a .sw and a .VVD file.
in 15 minutes, using extremely mismatched textures from half-life 2, i made this:
So, do you think it is possible to convert any of these files formats into a FL-friendly one? would this be of any use at all?
It would be possible to convert them through Milkshape most likely, you would need an import filter for that though.
But with that said there are already better options available, Hammer really isn't suited to complex modeling at all. It was designed for Half-Life and should probably stay with Half-Life.
If you're really dedicated though I recall that around the launch of the Source SDK it included the ability to export to a .VMT (or something along those line) which could then be imported by Softimage XSI and developed from there.