well there was a guy on my local craigslist selling 2.
he said they were celestion on top and ev on the bottom.
when i got there to check them out, we took them both apart and found mc90s on top on both, and vintage 50 watters on the bottom.
i bought one of them from him and swapped out the 50 watters with 2 c90's i had sitting around here.
the cab is heavy, but nothing i can't handle.
i'm a skinny guy, but i'm used to lugging 4x12's. its nothing insane.
i'm sure it is with ev's though.
as for the construction, by looking at the insides, i'm pretty sure its the same thing as the regular halfbacks except instead of tolex, they used a thin vinyl lamanent (like on road cases), and all that metal hardware with a plywood front pannel that latches on to cover the speakers.
i played both cabs at the guys house with a pod xt -> 2:90 -> into both cabs while they had the 50 watters in the bottom.
they sounded meaty as ****! this guy had his guitar tuned to c sharp, and was so ballsy and thick, but clear and tight. i'd never heard a pod sound so good! just goes to show what a good stereo tube power amp and good cabs can do.
i can buy the other one for 350 from him, and i think i might do it when i get paid.