There are none available at the moment
The closest you'll find is the Space Orks shipset lurking around somewhere but I cannot remember the URL or indeed the author.
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The Unofficial Space Empires 4 Mod Utility V2.0
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Download as a .ZIP <
HERE>
Download as a .RAR <
HERE>
Download as a .ACE <
HERE>
Check a Screenshot of it<
HERE>
Check an Alpha Shot of my Mod Editor (Unreleased) <
HERE>