Only one mesh - no, it's not really a problem. You can always use the Grouping Tool to decompose the ship into multiple props. Just create a new group, add the groups you need for your scene, spawn a prop fron that new group (it'll copy over the texture maps and materials it needs), and delete the original prop from your scene. You could even save the new prop to your prop library for reuse. 390k polys: yes, it IS heavy on Poser 6. I tried. Don't expect to use this ship plus an entire crew of Millenium 3 figures - won't work!

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

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