There's no poly limit in BP
Bumping this discussion to note: I recently ran into a 64k vertex
(not poly) limit per subobject. If you have a subobject that's over 64k vertices, you'll need to split it up or remove some detail for it to work in FS.
Clarification: the vertex count you'll see in Blender/Wings/etc is lower than the number that will exist in the POF, because of vertices being split into smoothgroups. Basically, for every hard edge that a vertex is a part of, that vertex will be duplicated.
Non-clarification: when bugging people about this on IRC I was told the limit is "64k". Not sure what it is exactly, be it 64000, 65536, 65535 or some other number. I kept my subobjects below 64000 to be safe.
ON (a recent) topic: This is an excellent model! Slight criticism: Some of those turrets near the center look like they wouldn't be able to pivot fully. In any case, it has an excellent aesthetic that isn't very common in FS, and I'm looking forward to seeing what you do with textures!