12 years ago I added a 12'x14' screened porch to the back of my house in Maryland. The screen porch was permitted and inspected when I original built it. I'm now thinking of upgrading the room to a 4 season room. I would like to keep the room as open and airy as possible so in spring / autumn it can still feel like a screened room but in summer / winter it can be cooled / heated as appropriate.
Currently the screened porch has double 2x6 resting on 4x4 posts at 4' intervals. My plan was to keep the corner posts but remove the additional posts and replace them with more traditional 2x4 framing around the windows / doors. The roof has 2x6 rafter ties running across a 4' interval. Pic of the propose changes below.
Is the framing approach correct? Originally I wanted more windows but when I spoke to the licensing office the explained that because of lateral loads I needed a minimum of 2' of solid wall in each corner. Is there any easy (code compliant) way to avoid / minimize this)?
Revised to focus solely on the framing question.