I've been building amp sims, all with 2 or 3 knobs only, and all in 1590B enclosures. Only amp style I can't get to work is mesa. (Well, and soldano) I think I can get the Dr boogie to fit in a 1590B removing the trimmers (I'll happily socket the resistors) and fixing all pots at halfway or so, except gain, volume, and treble.
I tried to draw a layout, and I'll try again; but I thought it couldn't hurt to ask for help, if anyone with that fancy software wants to give it a go.
www.reverberation.com/rockglenn