"Item woodplankcircle" Please?

Yes, I think so too. You can build such things by yourself, but fixing round windows in nearby walls and so on, is a litte bit tricky and most time it's glitching and looks not very good and not even perfect.

Yes! Totally this. Round window frame, round plank, a cylindrical wood beam, and a wood ring like a hollow cylinder (both inner and outer diameters and height should be adjustable.