First off, don't get my post wrong as I mean no disrespect to anyone creating what I term as DUD's (Dress-Up-Dolls).
There is admittedly, a great deal of talent required in actually making the DUD's and accessories
I personally have only 3 months experience in DAZ and Hexagon myself and I was drawn out of Daz (after the usual romance dulled) and found my personal interest in the tech and detail stuff that comprise props, sci-fi related props in particular.
This site is about the (ST) vessels and props not available on other DUD sites.
Literally anyone, regardless of experience or talent, can make the characters via Daz "DUD's" now days.
The uniforms, characteristic morphs and props are all available as accessories in Daz and many Free sites on the internet and all you need is a little time to morph the faces into whoever you want to mimic.
If you want to buy DUD accessories, see the Renderosity or DeviantArt site.
Search via the key word "Trek"
DeviantArt has people on it who will full fill via contract, your personal requests for specific characters if you're not interested in making the DUD's yourself.
Hope this helps.
Handy