Hey, i'm a junior animator that worked for slithly less than a year in the industry and I decided to shift my expertise into rigging...
I do have "somekind" of rigging reel however I havent edited anything yet but i'll send my work personnally to any interesting project.
My stuff is on my dropbox folder and I just dont want to bust my bandwith :P
but here's a snippet:
its the soldier from tf2, rebuild the rig from sratch to include stretch ( that can be toggled on/off) for arms/legs... helmet has 4 different 4 pivot point to rotate properly according with wheres the contact with the head ... the collar follows head movement if the head comes close... facial is done with bone although I added a few morpher for fun + some neat script to controls various options.
Btw: I do know how to work with udk , its been a while since I opened it but I used to know how to build animtrees/ragdoll etc...
So just send me a pm if you're interested and ill send more work.
but if your question meant something like: have you ever importer a rigged character inside UDK.... then yes I have... and many times but most of the times using biped and adding on custom twist bone + more controller