Imo without a shade cover it's gonna get very hot and humid not to mention the sun might bleach some color from the flowers. The internet says light degrades the thc but I've never left any out in the sun so I can't verify that
With the plastic cover and ventilation you should be fine. Just watch they don't dry too fast or go to molding. If it were me I would hang entire plants and trim when you take em down
I treat my tomatoes and mj nearly the same and it works for me.. got 7' tomatoes in my yard and 4' mj out in the guerilla patches. Everything seems happy and healthy to me
I normally need a little better than half the sq feet of my flower room for veg... you'll have about 40sq' so I'd set up a 5x5 veg and you shouldn't be too crowded