I suppose a part of it consists in inheriting Peasants, then exchange all your Estates for one each of 3 upgrades. (Peasant is lying on your mat)
Bonfire can take care of the coppers.
Lurking Fortress could provide the last card, but I can't see how one could get the Lurker in the first place.
So, I'm really at a loss here.
Edit: I think I got it:
Ferry BoM, Inherit it (Borrow and Baker are your friends).
Estate as Bom as Lurker gets you a Fortress. Estate as Bom as Peasant gets you Soldier and Teacher.
Estate as Bom as any trasher gets rid of the coppers.
You have one Estate, one Soldier, one Fortress, one Band of Misfits, and one Teacher.