#1
I'm more a guitar person than a bass person but i thought I'd improve my PJ-bass!
parts i'm using:

http://www.long-mcquade.com/products/13852/Guitars/Parts/Gibson/Potentiometer_-_Short_Shaft_300k_Volume.htm

^I'll drill if it doesn't fit but can i wire a 500k rather than a 300k for volume? hopefully getting a result close to "Mark Hoppus's" bass.

Pickups:

http://www.long-mcquade.com/products/7294/Guitars/Accessories/Seymour_Duncan/Quarter_Pound_Jazz_Bass_Pickups_-_Bridge.htm

http://www.long-mcquade.com/products/7293/Guitars/Accessories/Seymour_Duncan/Quarter_Pound_P-Bass_Pickups.htm

Ok so those are the parts: 2 pickups and 1 volume knob. anyone have a wiring diagram?

oh and the bass I'm using is an ibanez sr490
#2
This might be better placed in the building forum. But hang around, and someone might get you what you need.
I have:
Acoustic B200H+B115 cab, Schecter Stiletto Custom 4, Rondo Fretless, Boss EQ-7.

Some men just want to watch the world burn. And they work at Behringer.