Thanks 
So far I haven’t upgraded the rear shocks, but I plan on it as soon as other financial obligations are taken care of or they wear out whichever comes first. I did however put air bags in, and I usually run about 20lbs ‘unloaded’ which means no camping gear. But the platform stays in there with power full time.
Because you have 3/4 ton, you could get away with nothing if you’re just rocking the GFC and an empty box. I would find that highly unlikely, so I would strongly suggest air bags. That way you can adjust the rake of the truck based on weight, even if you upgrade springs and struts.
As for the mosquito screens, the back one is a hardware store Magic Screen cut to size and Velcro’d up. The sides, I taught myself to sew and made them out of a salvaged kitchen tent screen that we were no longer going to use.
You can check out all kinds of the fun things I did to the rig from the get go here: