Blending 'extended' wall

[sport1901966]

Hi all, looking for some experienced input on a task I am about to under take.

Currently our bedroom has a little alcove off 1 corner making use of space over the stairs as shown in the brilliant sketch below:



We are redoing the whole room, and one of the improvements planned is to build a stud wall & door frame over the front of the alcove as per below:



The opening is not much bigger than the outside of the full height studs when including door+jambs+jack studs+rough opening clearance, but will still require a small amount boarding and plastering.

From an overhead view this is what I have in mind:



Door jamb depth will be 119mm, so stud width+2x12.5mm board+2x2.5 plaster should bring the final wall surface to the same depth as the jambs.

My main question is, with the plaster layer, will a decent blend with the adjoining wall be achievable?

 

[sport1901966]

Has anyone done this type of job before?

It seems the best thing would be to mount the frame such that the plaster board is ~2.5-3mm back from the existing wall surface, then recess the first couple of inches of the existing wall from the joint, then skrim tape and plaster the new wall/frame and across onto the recessed area of the old wall?

 

[Micilin]

Yes, you can skim like that (and just blend in the joint with some Easifill or filler if you need )