I had always been against side mounted jacks.
The strongest foundation of any bass, is its perimeter (side) walls.
One of the last thing I would ever do, or request, is have a hole along the sides of my basses.
Lessons learned from my Ibanez bass when it fell off its stand from me tripping over the cord.
There it was... a hair line fracture inside the inner cavity of the hole. Yeah, it was a freak thing, and I should had paid more attention to where things were, but finding that it cracked around the hole area and no place else, was just common sense, that a side hole weakened a once stronger wall, un-drilled or once untempered area -- thus now, prone for a clumsy guy like me, to trip and break. I am pretty sure if the side wall was not drilled, the bass would had been able to absorb the shock without cracking in the first place.
For anyone who wants to side mount their jacks, go for. It's your custom, not mine. I'm just offering a friendly word of caution.
I hope this never happens to you.
(Message edited by toma_hawk01 on October 11, 2009)