Acrylic for zinc boxes.

Do whatever you like to em. Despite the price you paid, non of em are expensive.
I just got a Way Huge Aqua Pus for fathers day. Not a good sounding delay at all. Thats coming apart this weekend for a bit of jiggery pokery to the insides. Painting a box is a nothing thing. Depending on how much I do to it, it may get a new box. The way huge one is ugly anyway.

Also if you want to transfer to different boxes then use the Hammond (1590 I think gives the best size).
http://www.pedalpartsplus.com/mm5/merchant.mvc?Screen=PROD&Store_Code=PPP&Product_Code=1126&Category_Code=ENC15

And get one of these

http://www.tooled-up.com/Product.asp?PID=109092

Because pot, jack and switch holes are all different sizes. That will save you a load of time, heartache and moolah.

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No no and no

Thanks Niki, looks very dandy. What about for the LED hole?

I think the hammond may be too large for what I need. This is some pretty exciting stuff for me though as I'm a relatively new DIY'er.