Looks like fun! How are you going to use it? I mean to say; what will the enclosure look like? Stompbox, with knobs on the top, "IN" on the left, "OUT" on the right? 1RU? One of the first things I do for a PCB is physically lay out knobs and I/Os and imagine using the thing. Does the layout make sense? How will the cords drape? What if my fingers get really fat? Although really a picture/drawing/Notepad approximation of connectors and controls is all that'd needed. Failing that, a few pictures of other projects that match your design aesthetic would get us there.
How do you plan on powering it? If it is a pedal a PCB-mounted battery pack could be drawn in-- would you still want a power jack option? Would you want a list of part numbers (what company?)? Caps in particular can vary in size, though one could use footprints that allow for a couple of different sizes.
I like to draw things so that they can be etched or followed for bread-boarding. I can go tighter if you plan on only etching and needed the space savings. Speaking of which: double or single-sided PCB? A single-sided would be simple but a double-sided usually is quieter and smaller. A double-sided design as a breadboard would have a bunch of jumpers on the top, but that's not a bad thing.
Tho-- there are quite a few pots. Just about any PCB design, regardless of the designer's vigilance would fit behind them.
What kind of file are you wanting of the artwork? Do you have biases for certain types/brands/colors/fonts? I would hate to use Times New Roman when you're a helvetica kind of person.
I'm pretty easy and since it's about to be too rainy to bicycle (casually, anyway-- yes, I'm the hipster #%$ in front of you on a bike with PBR in the saddlebag) I wouldn't mind laying out a PCB for relaxation.
I'd guess it's take about three hours for my obsessive compulsive ass to do it (three times). I'll trade you a melodica. Or a used computer audio interface. Or a brass instrument. Beat-up and obsolete is fine. I'm more interested in an interface/instrument with a story (that is to say, the story of my boyfriend playing a melodica etc that PCB brought).
Sorry for the typical forum first-response: "More info, plz."