I don't know if there is a skinning tutorial out there solely for crew members, but here's what you can do.
Use SH3 Unpacker or Sansal's Pack3d (Better in my opinion)
here
Then unpack the game's tga files (read instructions that are on the site on how to do this)
Then edit the crew tga's with any tga compatible photo editor (Photoshop, Gimp)
Then apply them to the game.
Or.... the easy way is to just use the men at work as a base and do your thing, just make sure you check the readme on that file to see if it's allowed to be editted. Then make sure you give credit to them for the original template.
If you have any questions about it, just post on here and I'm sure we'll all be happy to help out.
