Try it but this weather is shit maybe a waste of time. I have a big back garden and i still wont grow outside. Have 3 autos indoors. Have a zkitttles photo dying to grow it outdoors.
I bought the same windshield protectors in lidl i have 6, have poles for a 90 x 90 x 180 tent but no cover! Doing a test with seedlings in my sitting room but the light gets through very easily.