No, we're not welding on Fox shocks. We use a lot of Fox parts but many of the parts are custom machined and fabricated. If you start here you can see how they're put together:
https://www.ultimatesubaru.org/forum/topic/144953-long-travel-outbacks-or-making-subarus-faster-and-more-reliable-offroad/?page=25&tab=comments#comment-1355228
If you're using a-arm suspension just use threaded body coilover shocks - Fox, King, etc. Depending on what you're doing with it I would look into some of the position sensitive single shock options - internal bypass (IBP) or coilpass (bypass tubes above coil springs). Otherwise most offroad racers run two shocks per corner, one is basically just a coil carrier with a little damping and the other has external bypass tubes.