Retrofitting a door I to an existing brick opening is tricky, this looks good. Screen should slide smoothly.

Check your local codes for maximum gaps please. In hurricane areas 1/4" is the max. My retractable screen never seemed to work.

A code for the gap between brick veneer and the brick mould?

I need to see the sreen but they are a bit awkwars usually but after awhile they get easier. As for the actual install of the door it is tricky to retro fit windows and doors in brick walls

Thanks for all your inout. But if the new door is measured correctly why is it tricky to install. We had another patio door installed recently and there were no issues

That was a typo. It should read input