Thanks Bryan, Earworm.  I've only tested drums so far, but it sounds honest.  Not a lot of echo or exaggerated bass that I can tell of.  Of course, I still have two more traps to order for the back and foam that is on order for the back wall, possibly a cloud above mix position to add.  The sides and front wall are treated.  I may fire up the guitar amps this weekend and give a little more ear testing.  
Tarnation,
I built the desk myself to house the 24.8.  There is a thread from about a month and a half ago about the building.  The only plans I had were impromptu scribbles for dimensions.  I used 3/4" Oak plywood in 4X8 sheets, #12 wood screws, angle brackets, 1/4" lag bolts to attach the wood "dividers" to the bottom plate, and 1x12" pine for lateral stabilizers between the legs.  It is sturdy, but man is it HEAVY!