I think that's what several makers do...one guy actually calls it a mini-Plexi.
But, this guy's take really kills, I think. played it through a 4x12 and it brought the goods pretty well. And yes, BobR has stopped building. The guy in town doesn't commercially build that model--I encouraged him to...but, he sees it as a $1k one trick pony...which it is, I guess. Cool truck, though!
End of the day, there are plenty of "Marshally" pedals...Dirty Little Secret...I have a vintage black box Marshall Bluesbreaker that's fab if you don't want tons of gain...Barber makes nice classic rock sounding pedals--love the little Small Fry...all of the above is the cheaper way to get close than any of these 5wt tiny speaker things, IMO.