TWO STICKS OF DERM & the
Crankshaft (Cranker) or the
Cleaver (Katana).
Other considerations on the diminutive side, but not all (check build docs for PCB's measurements)...
Chrome Dome (GTC Bloody Fingers)
Cleaver (Katana, as mentioned above)
Danube (Skreddy P19)
El Sol (EQD Acapulco Gold)
Kazoo (Basic Audio Zippy)
Lemonade (Lumpy's Tone Shop Lemon Drop)
Loft Fuzz,
Green (EQD Spires Green)
Loft Fuzz,
Red (EQD Spires Red)
Propolis (
Union Tube & Transistor Bumble Buzz)
Zonkbox (D*A*M Zonk Machine [Hornby Skewes Zonk Machine])
Okay, for the above suggestions — the larger 1590B-sized PCBs, you won't be able to fit much more than a one-knob boost or fuzz in with them. Of those larger PCBs I tried to select ones with minimal controls; large should be no wider than 49.5mm (1.95"), so should fit 1590N1 with an extra one-knobber without too much fuss. Two 1590A-sized one knobbers in a 1590N1 will be no problem. I'd consider going 1590BB just for foot-space between stompers and can have more controls, like 2 1590B circuits, in place.
Also, the above list is only just what I selected off build docs from my Hard Drive —
if you peruse the PedalPCB Shop's
OD/DIST/FUZZ you'll find many more.