NPN Fuzz Face
Not that the internet needs another Fuzz Face layout, but I'm adding it for the completeness of this collection. It is a DIY standard after all. This follows the stock NPN silicon version with BC108 transistors.

I've added a anti-popping pull down resistor, a power filter cap, and polarity protection diode. There a host of modifications to the circuit you can find on forums and the like, but one I highly recommend is replacing the stock B1k fuzz pot with either a C1k or B2k pot. This will give a better sweep of the range of fuzz. It's also not a bad idea to replace the 8.2k resistor with a 10k trimmer or B10k pot (wired as a variable resistor) to help bias Q2 correctly.

There are many different transistors that sound good in this circuit (I've used 2N2222 and 2N2369 trannies with good success). Just use sockets and try different ones out.

This would be a good candidate to fit in a 1590a enclosure. You could also use this layout to make the PNP germanium Fuzz Face, the ColorSound 1-Knob Fuzz, Tone Bender Mk 1.5, or the Roger Mayer Classic Fuzz. Just look up the schematics and note the component changes.

UPDATE:
I've verified the layout and put it in a 1590a using 2N5550 transistors. Here's pics of my build: