At a glance I don't see what's going to need welding. I can't comment until I see a LOT more pics. Pull the lamp fixtures and see how badly damaged the metal behind them is. It really looks like the hatch took 90% of the damage. If so, used +89 taillights = $125, used read hatch from a salvage yard = $80 (if it includes the glass, $40 without), used rear hatch latch and lock = $40, used rear bumper skin reworked to look brand new = $400 (find a used white one and you're set for $100 or less)... This depends on any other metal damage though.
I'm not an autobody specialist... I've just had to learn how to get by without paying one.
Post more pics, I'm sure someone here might be or know someone in the business.