Wow! This looks great (sorry about the prototype aspect)
So, do you have any plans for this? I could definately see building one! (I currently have a metal sega naomi cab that I got for cheap because my old cab had an issue, and have wanted to go back to a wood cabinet for a while, but hadn't decided on a cab style)
Also, would this fit a 27" benson? Its got the angle, so it looks like the back is probably ok (or might need a bit of an extension out the back).
Anyway, good luck!