I hear ya. But remember, you are talking 4 feet on each side. When i talked to Ali about the T5 with a single swing door and how they keep the roof from sagging while using a single swing door, she told me Mark actually builds the perimeter of the door bigger. So instead of having the same size opening as the sliding glass doors, it will have a smaller opening as the borders need to be thicker.
Also if you were wondering about replacing a scratched acrylic door, i talked to Ali about that too. She said, you can knock the pins out of the hinges and they send a new acrylic door with half the hinges bolted to the acrylic. So you just line both halves from the front frame to the door and push the pins back in.
I bug Ali a lot about stuff lol. I also talked to her about bolting cages together and ideas there but thats another story. My phone bill is a expensive whenever i talk to Ali at AP hahaha.