Nice Taff, Note the jack on my headstock too . ( the cable runs down the truss rod channel ) ;-) LOL . The pickup is actually an electric razor motor . ;-)
If you want to follow standard store bought guitar builds the volume is the closest to the strings. But if that's not what you want then do what you want. It's your guitar.
In all seriousness . as long as they are not where they interfere with playing or strumming or palm muting etc .. have at it . note . some folks like the volume closest to the strings to do "volume swells" etc ..
If building for someone else , ask them their preference .
If building for yourself .... Have fun with it .
I once knew a guy that drilled the volume pot hole too close to the edge, it hit the frame and wouldn't close. Heh, heh. I ( mean HE) had a fun time fixing that one!