This subject intrigues me because, from a backpacking paradigm, the tent keep the elements off you while the sleeping bag is for warmth. In your case, it looks like you're expecting the tent to also provide a warm dwelling area.
My contribution is to buy some seam sealer for the tent, even though you are planning on having a canopy over it. The seam sealer seals the little holes created when sewing the seams. Moisture can/will get in through them, and if you have a storm, rain can fall other than straight down. My family had a Coleman 10 person tent, and we did this. Our camping friends had the exact same model. It rained one night and the differences in water penetration were noticeable.
Another thing I like about the canopy idea is that UV light will eventually weaken nylon. Since your setup will be up 24/7 for multiple days, the extra protection afforded may (over a long time) really help prolong your investment.