I definitely plan to desecrate the SW symbols a bit, the skulls will probably all be brass to some degree, or splattered with blood and such.
As for the Bloodthirster from FW, that thing is sweet as hell! Too rich for my blood at the moment, but in the future I'll probably pick one up. I've been fiddling with my Bloodthirster, too. I took a spare Juggernaut head to make him a helm. Looking decent.
I'll have to check out the 13th Company. I know a little bit about their fluff, and that might work out. In theory I like the Wulfen mutations and such, but obviously that didn't take place with this squad.
Next I'll take some pics of the commandos and WIP of my Bloodthirster's helm..