I'm looking for a cheap easy solution to fill in a hole in a wood stock and maybe add a little extra "meat" to a stock to give it strength. The stock will be painted afterward so appearence isn't important. I'm thinking JB Weld? Will it give me the strength I am looking for? Is there something better out there that I will be able to find easily and affordably?

There's all kind of stuff out there, Acraglass, Devcon and others. If your just pluggin' a hole that's gonna be painted, JB will work fine. Automotive "Bondo" will also work.

I'm doing this one as a pseudo-lightweight and wonder if I didn't get a little carried away in skeletonizing the stock. I'm more worried about adding a little strength to one of my corners then the hole. Think JB will be ok for that?

Kinda hard to opine without seein' it, can you post a pic?

Where are you looking to add strength ?. Wood filler will do nicely on the hole as it's what your base

material is . JB Weld is fine for many things but not what I'd recommend for " Filling strength " or

corner reinforcement . As Cragister says seeing where your attempting to fortify is paramount !.

Epoxy and fabric is a far better choice of materials for " Strengthening " purposes .

bondo may pop out if its a hole .. marinetex for me