Thanks, Martin, I appreciate that.
Gordon, the Webasto is under the dash and mounted through the fiberglass firewall. The exhaust goes forward under the tank then down just behind the beam on the passenger side. It sticks down about 1/2" from the aluminum under-pan. I have heatshield sleeves on the corrugated stainless pipe as well as stick-on heat shielding on the top of the footwell and the bottom of the steel tank. It has worked flawlessly for the last three years.
I'll post up some pictures later on to illustrate, but you can just see the pipe in the third phot in my previous post. Look all the way on the right side in the background.