Well, by way of a small update, I've been living with and using this rig since April last year and am absolutely chuffed to bits with it. It is a bit on the heavy side but worth any effort for the pleasure of using it. I am looking for a 1818 cab so I can pick and choose which to use, depending on my mood!, but the combination of 15" and 2 x 10" is brilliant. I am still finding new sounds, too, though almost always usually use the pre-shape. Also, and I know it is extremely shallow and childish to take pleasure from this, but you always get an appreciative nod of respect from sound guys when you wheel one of these out.
Here it is (well, half of it) in action last month, together with a bit of a bass face:
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