Congrats on the new CG. You will love it. I loved mine so much, that I got a 2nd one....
I do not use a cover at all on mine. I had read where a lot of people have had difficulties with the cover holding together. So I just opted not to use one. Mine first one is almost 2 yrs old, and doing fine.
Just close the vents and you should be fine. Only one time did I find some water in mine. We had a down pour with about 4 inches of rain one time.... other than that, no problems.
As far as the paint peeling and blistering on the sfb, after you cook, spray some veggie oil on it and it should be fine. If and when it does get real bad, just get some hight temp paint and spray it. But it will blister and paint again. Be sure and oil the hinges as well.