I've got one of Terry's quick-draw sheaths. It's really cool and I highly recommend it. It's easy to appreciate and enjoy the sheath as an ingenious advance in design. If you happen to live in a dry climate where tight khuk sheaths can be a problem, it'll be a nonissue with your quick draw rig.
My only problem is that my quick-draw sheath houses a giant sirupati. I think it might be 30 inches, I forget. Hard for a mere mortal to control.