I have an older 5,000  BTU propane fueled
catalytic space heater.  I'm offering to the first
person who commits to paying $75 plus UPS charges
for it. (Probably about $7.00 for 10 pounds)
United Parcel Service rate page:
Http://www.ups.com/using/services/rave/rate.html

Dimensions:
13 1/4 inches tall
8 inches wide
6 inches deep tapering to less at the top.
You could plumb this in permanently or run it on a
separate tank as you see fit.  It has a protective
front screen to prevent casual contact with the
platinum impregnated catalytic media.
This is NOT a vented model like the Platinum Cat.
It does Not have the electric resistance self
starting preheater coil.  It is just a very simple
but fully workable direct radiant type propane
fueled catalytic space heater which may be fueled
by disposable cylinders if you get the  adapter,
by connecting into an RV propane system, or run on
a barbecue sized tank.  The working temperature of
the platinum impregnated media, which appears like
a huge tan colored 3-M Scotch pad, runs around 700
to 800 degrees F with no  flame and no carbon
monoxide.   But it will make heat, water vapor,
and compete with humans for Oxygen, so you must
run unvented propane catalytics with some open
pathway to allow air exchanges to occur.

I believe that if someone wanted to remove its
rear cabinet which allows for storage of two
disposable propane cylinders, the depth could be
reduced enough to fit inside a Westy sliding
door.  Without the rear cabinet, it could be
reduced to about 3 inches deep.
If you're interested, respond off-List to
LvLearn@mci2000.com
John