Could do 3” from both sides but I think it would be better to take it all from one side (you can see the line on the horizontal where I’ve marked it). Mainly because of the way the rooms are laid out currently.
I think the issue with just using wood would be making it look good after, unless I have a really wide architrave to cover it?
So long as the wood doesn't have any movement in it (tough for a door frame I guess?) then it should be skimmable. Presumably a plasterer would put scrim tape or some kind of mesh over it to give the plaster a nice key and avoid cracks?
Could do 3” from both sides but I think it would be better to take it all from one side (you can see the line on the horizontal where I’ve marked it). Mainly because of the way the rooms are laid out currently.
I think the issue with just using wood would be making it look good after, unless I have a really wide architrave to cover it?