Hey Robert-
Okay, I'll throw my two cents in
First off, congratulations...it's fun to manipulate hot steel! All arguments aside from what's better...it's F-U-N!!!
I would highly recommend if you want to build the freon tank forge for damascus, that you do it vertically. It would take very little mods to make the one on Reil's site vertical and much better suited to damascus.
If you don't go vertical, I would then recommend that you don't put a high alumina shelf in for a floor, but instead just mold a trough in the kao-wool. This could be improved upon by adding a stainless shelf and or throwing kitty litter (clay) into the forge bottom.
Otherwise! you will eat through that little forge like water on cotton candy when you put borax in it.
How do I know???
Now if you want to start talking blowers, that's a whole new ball of wax. I run a large vertical blown forge...very much thanks to Bill Cottrell (Plain Ol Bill). In a forge like this I have a more even heat, more control of my heat, almost incomparable improvement for acceptance of welding flux, and MUCH MORE fuel efficiency.
But that's another story.
Personally, I would just recommend that you stick that freon tank on it's end and put a venturi burner near the bottom for a great start up forge.
Nick