Let's see if I got your idea correctly. You want a 1920x1080 window total, where the play area, i.e. the /viewport playable area is in a 4:3 aspect ratio.
Something like the attached image?
That would make the playable area... something like 1066x800 if you want to leave enough room for a decently sized chat window. A viewport of 1200x900 would leave a mere 180 pixels for the chats and might be too little (picture was sketched with those dimensions).
That leaves a LOT of room in the sidebars.
This is actually my 2nd UI. The first version was made for a resolution of 1280x1024 (4:3) but that's not what you're mentioning here.
Edit: Unless you mean just a left and right bars with the viewport spanning the full 1080 height
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