Thank you for your reply, Ricci.
"Budget" is always an issue in the real world, but large size is actually a benefit to me, as I prefer my systems to have an imposing appearance. And from my own subjective experience, I have found larger cabinets to produce a more natural sound.
For bass horns, anything not exceeding 4'x8'x32" is good for me. Therefore, even though the "Skhorn", from what I can tell, seems to be a fine feat of engineering... something akin to the Othorn would probably much better suit my needs.
I read somewhere that you had designed an "improved" version of the Othorn. If this is true, are those drawings currently availible? And what are your own thoughts regarding the revisions you have made?