Well the head cab is built and painted, it's in the queue for covering and should be complete in a day or two. The amp apparantly sounds great, as reviewed by a few folk now, so things are looking very good indeed :D
I gigged the 4x12 on Saturday playing the first set with my JTM45 and the second set with my Laney Super Lead (modded Laney Klipp - used to be Super Bass spec but I had it switch to Lead a week or so ago). Both amps sounded fantastic though the new cab, and it was the best tone I've ever had. Great punch, clarity, shimmer, bite, harmonics - the lot. Very, very satisfying to play through either rig and I got some very admiring looks and comments on my setup and tone :D
To my ears, and my wife's, the JTM45 just pipped it in the tone stakes, but I had nowhere to go volume wise. It was fine for that particular venue (medium sized pub), but not for anywhere bigger. The Super Lead had another third of the Master Volume left.
So I'm hoping, and it appears to be, that the 45/100 is a cross between both of my current amps. The clarity and 3D tone of the '45 with the volume and increased attack of the Super Lead - the perfect combination for my needs.
You're probably all bored of this thread now, but I've still got a massive grin on my face in anticipation of gigging it for the first time on the 15th March :)