Well, I cranked the thing up with the Ecstasy on it tonight, and I'm liking what I'm hearing, but especially on the top Vintage 30 side. I'm thinking that the criss cross pattern will change to Vin 30 on top and both G12T-75's on bottom for the lows and high cut. And micing it will mean micing a top speaker.
My ears are really tuned to the Vin 30, and it's also what the Bogner was designed around. The cab is pretty much the same construction as the Bogner 412, although the Bogner has some Corning insulation placed in it......that's about the only difference.
One cool thing Marshall did was drive a screw through the back panel into the center spacer to solidify it's connection.
I think eventually this cab will be Vin 30 on top and H30 on bottom, getting rid of the G12T-75's. They're good speakers, but I want this cab dialed in 100%. Overall, the cabinet is bouncy resonant and totally rocks. The bounciness of the low notes and smoother highs is what separates vintage construction cabs from modern JCM 800/900 cabs.