First....you're gonna kill that tree behind the setup if you leave it there, even just shooting .22. Secondly, I would have put longer chains on the steel targets. The closer the targets are to your wood structure, the faster you are going to need to repair it. Only having a inch or two clearance between the steel targets and the support structure means not only are the near misses hitting the structure, but so are bullets that deflect off. A 2x2 or 2x3 don't take much abuse from even the lowly .22LR, before it's done
Otherwise, nice setup, welcome to the world of handguns and enjoy!