I do all the wiring with the back off and mask off the insides of the f-holes and other holes. I have had good luck leaving the entire wiring harness inside with little fish lines running to the appropriate holes. If nothing else practice getting the harness in and out.
I found it very helpful on 335 style guitars to put a terminal strip in the pickup cavities so I wouldn't have to pull the harness in and out to work on pickups.
It looks like your side walls are thick enough but if you feel you need reinforcement for strap buttons or anything now is the time to do it.
Bind the f-holes if you are going to.
And of course glue your maker's label directly below the bass f-hole and sign and date the top
Thanks Freeman, great advice.