I've been planning this one for a while, and finally have the first finished example in the proper enclosure. I measured the last FY-2 to pass through my doors and recently got round to reworking the plans and taking them to the metal fabrication place. They've improved upon the vintage boxes by using 1.2mm steel (still not heavy, but no longer bendy!) welding the joins, and using treaded inserts for the side screws.
The circuit is the FY-2 companion fuzz and FY-6 Superfuzz. Choose either with the big toggle switch and the controls are:
FY-2: Fuzztone, Volume (little switch does nothing)
FY-6: Gain/Sustain, Volume, tone switch
I'm thinking £130 for these, which I know isn't cheap, but there are a couple of NOS parts in there and the parts count is relatively high. Besides, the boxes are proper pro.