Great advice above - front open egg access, not a top hinge. Easier for you, much lighter, less prone to leaks.
You are on a budget. SKIP THE WINDOWS. Instead, extend the overhangs, and open up ventilation along the whole of the top, under the roofline. Sure, its less attractive, but its ultimately more effective, and certainly cheaper.
You are in hot and humid. Check your prevailing winds, then consider making the side that opens into the run wide open - no point in adding $100 - $150 in plywood if there's no severe weather to shelter the birds from.
Go with the ground as your floor and deep litter method (make sure to adjust the geography of your yard so that rainwater folw away from the coop and run, not towards it.
I don't see any discussion of roof - but your building size is "odd" for off the shelf solutions. Since you are on a budget, I suggest metal roofing - its cheapest per sq ft right now, and easiest for a novice to install correctly. If you want passive light inside the coop (assuming you don't delete one wall as an open air design) you can sub in one or two panels of polycarbonate in place of metal to let light thru from above.
I would give a lot of consideration to "turning" your building 90 degrees so its the width of the kennel, and altering its dimensions to something that will require fewer cuts - then use the savings on the deleted floor and "front" wall to make it 6' deep, and use 8' roofing panels to ensure a good overhang.