well...
If you want an example, I think the Raynor
does look Freespachish to me, wether it looks like the Vulture or not. Maybe its the textures, or maybe just the model, but it looks to me like it could be an actual ship (a good one) at that. On the same not, I don't think the Battlecruiser or Wraith would fit to well in, at least with fs2 era ships. The Wraith is too skinny me thinks, but with
some tweaking, I think the basic model concept feel whatever you want to call it, could be adapted to freespace.
Another example would be Woomeister's stuff. Most of his ships really feel like they follow the same design lines (yes, given age of the universe as well) as the Freespace series. While he has some models I don't like, they could still fit in.
If you want a contrast, take Freelancer's ships. A direct conversion of them into the FS universe would look really bad imho because they are

more artsy and 'atmospheric' looking than FS ships. Now that doesn't mean you can't take them and play with the design feel, make them more freespace-like with the blockier feel and more space warfare, rather than looking nice feel.
So, if you want me to just bring it upfront to you, the Homeworld ships don't have the full Freespace feel for me. But, with a few minor changes, I think they could actually look the part. I.e. the back wings. They don't really serve any purpose in space, not to mention they're rather small to do much. I'd say scrap the wngs, then make a sort of shark tail on the back. And the Cockpit area, it seems like its bigger than the engine. And the whole thing seems like its way small. I don't know how big you intend for it to be, but it looks like Ulysess size. Me thinks it's partially the textures and partially because the thing is kinda 'modular' as in it doesn't really flow from one part to the next, which sems to be the design of Homeworld ships. So i'd make the back 'tail' be a lot longer, like a helicopter or a dolphin sorta.
Overall, I'm not saying your models are bad or anything, I just don't like the direct HW - FS translation, at least my eyes don't. Really, if you just played with the models a bit to make them flow more, changed the textures a lot, it would make a whole world of difference.