Need advice on how to fix my greenhouse

My greenhouse has a row of four panels that are on a hinge and can be raised and lowered by a motor to control the temperature in the greenhouse. This mechanism is broken. The right side (pictured) has a bent piece (the mostly straight toothy bar in the lower middle towards the right) that caused the right side to stay stuck open while the left side closed. This broke the glass in the right two panes.

This is the unbroken left side. Both sides have been taken apart to disengage them from the motor so I could even them out.

A motor! The tubes sticking out on either side are coupled to the motor by screws that take shear stress when the motor is driving things. These screws were both sheared entirely off when we bought the house. I thought I had fixed it when I replaced the screws, but I didn’t address the actual root of the problem.

I’m comfortable with replacing the bent piece, but I don’t know how to go about replacing the panes of glass. The existing ones have been glued to the greenhouse frame with the glass on the outside of the frame. I expect I could acquire both glass of the right kind and size and appropriate glue. My main problem is access. The greenhouse is nestled between the garage and the house and the two broken panes are the least accessible.

I could get on the roof of the garage, but it seems slightly precarious to lean out over a bunch of glass on a slope.

The inside has a table built in that prevents me from getting right under it. I could take the table out, but it looks like it was built in place and is rotting, so moving it would mean completely disassembling it and making a new one. That’s on the to do list, but is more than I’d like to do at the moment.

Side question: the outside of the cinderblock base isn’t doing great. How would you fix this?