Just saying, your avatar photo looks incredible man. I am currently waiting for this cabinet to be done, it may be a month or two before I am able to share the results.
Don't know about the G12H's, but I can tell ya from experience with T75's and V30's in a cross on bottom and 4 65's on top it is absolutely glorious. Played a festival in a park last year and got to really let my JTM45 breathe...damn it was good!
That sounds awesome, as the JTM45 is probably my favorite Marshall of all time. Currently I have been playing through either a 2 x 12 or straight into the house sound system lately. I am running only two vintage G12M's, and I think it sounds incredible. I can only imagine what some of you guys are doing with these 8 x 12's and stacks. The cabinet I am having built will most likely use special stuff from EC Collins. That 4 x 12 is clean, and straight cabinets to my ears sound better than the slanted stuff.
My friend who sold me this cabinet is good friends with Greg Germino, he told me this was his personal cabinet that he used to test new builds, I wont swear by that but I do know this cab sounds great.
I followed it back to your FB link, then: right click >> copy image then, click in your post body here & paste it in where you want it...