I see a couple prior posts. One wants a two channel brit style with full tone controls on each. Another mentions an overtone/plexi hybrid. What I am suggesting is along those lines: an unholy union between the Marshall and Dumble types.

What a two channel amp, each channel having it's own level and Drive controls, so a somewhat dumble style preamp. Only with a Marshall type voice. A smoother marshall type voice, I'm thinking Bonamassa and Eric Johnson.  Channel 1 is low gain, lots of clean headroom, huge bell-like, chiming EL34 cleans, to maybe old style plexi gain. Channel 2 is the singing, searing marshall voice. Probably voiced a little darker than most modern marshalls, with responsive midrange controls.
So, each channel has drive, level, treble, middle, bass, prescense and some appropriate switches for changing voicing. Of course a master volume, and a footswitchable boost. Oh, and plenty of low end. Some sort of boost as well. Maybe not a full tone stack bypass, but something that adds a little oomph without too much high end or a drastic change in volume.

HRM? probably, but the controls need to be "tamed" and put on the front of the amp.

There are other amps like this, Carol Anne OD2, maybe some two-rocks?  However, this would not be a clone of anything. It would be Nik's own interpretation.  Nik, are you up to a new challenge?