Dang, I feel like an idiot, but that is hard to see. And thats stripboard, or veroboard, not a breadboard. does the layout look OK? no huge glaring mistakes that I missed?
what exactly is the smooth pot for? Can I use an audio pot for it? If I want, can I forgo it and just jump them?
It does pretty much what it is named for....smooths out some of the high end and fizzly that is ever so common in fuzz pedals.

Use whatever taper you want. Remember though the taper the layout lists is the best option. Any taper will work though