Very impressive looking dampers with, as you suggest, massive progressive bump stops. I do wonder if they may place abnormal loads on upper shock mount to hoop though.
Have a look at
this thread particularly picture link in first post where the the shock mount has torn out part of the hoop! If you scroll down thread Rog has posted images of various MMC hoop designs over the years to accommodate the shock mount bracket which is also prone to break.
I think this may be why many prefer Rog's progressive bump stops acting directly on leaf springs. Food for thought anyway.
