Know anything about the Artograph Super Prism Projector?

I'm a traditional artist (see The Art of Robert Tracy) but do a lot of my compositions in PS CS5 these days.

My 30 year old Artograph DB300 died so I got the Super Prism early this year. So
bright, I could work upstairs when I use it instead of in the basement
with all lights out. But otherwise, worthless to me. I'd use the 300
to project an element here, an element there onto the paper or canvas.
A big savings in time, a valuable tool when needed. Could take an
outline drawing, project it onto canvas and be on my way. It would
allow for the most precise enlargements/reductions. The SPP not so good. It
weighs a ton (attached to my table, it'd topple the table, destroy the
projector) and can't project down onto my work table for
enlargement, and never a clear size adjustment--you twist one of the two
lenses and hope....your hopes in every case dashed.
How primitive a focus mechanism.

With the SPP you'd have to
project onto the wall for a 11 x 14" work--I'm not making murals! and I
don't draw standing up--I'm working on a painting that requires the
straight lines of the triangles. The 300 projected right down onto the
table. I suppose I'm just math minus in the head. Looks like I'd have
to build a heavy structure as high as the ceiling to get close to a 11 x
14" on the floor, and then hope again that the SPP is level with the
floor. I see pictures of people with the thing right on their work
table. What size are they projecting up to? A 1 x 2" thing? Doesn't make sense.
I never need to reduce, only enlarge.

Look at this math:
http://tracyfineart.com/various/imag...directions.jpg

24" -- 14'?! 32" -- 16.5'?! Enlargement from 200% up to 2000%?!
Jeez, I'm looking for an enlargement from maybe a half-inch element in a
drawing to fit into a future painting of 11 x 14". So I tried
reduction. Same thing. Primitive guesswork.

Suggestions much appreciated,

Bob