GrimLore
Bonsai Nut alumnus... we miss you
Hard for me to say not knowing the exposure to sun there but both the roll ups and door cover would reduce the direct light - not certain how much but anything is better then nothing. If they are not enough to keep it cool and dark I would highly recommend a temperature monitor so you can open up things when needed. There are also vents and other similar devices like hydraulic openers that open and close based on what you set the temperature at.
Grimmy
Grimmy