anybody here making p/j harness for sale?

If you are willing, I'm sure all of us here would be more than happy to help you make your own. Not sucking at soldering is a matter of having the right tools, planning and prep, and a little bit of practice. I'd add patience but that's too many Ps.

 

Give it a try, you won't regret You'll be able to teach yourself something useful for the future (and money-saving!)

For pots, if the standard size is too big, get the 3/8" "minis" (from stewmac or other supplier).
Any decent quality wire will do.
Once you've decided on the wiring diagram, post it here, we'll check if it is ok (internet is full of junk). Jazz Bass wiring is a good start, just do not forget you don't have the metal control plate, used as common ground on many JBs.

 

Here ya go ...

http://www.seymourduncan.com/support/wiring-diagrams/schematics.php?schematic=std_p_j_bass