Corner detailing to suit skimming

[endecotp]

Dear Experts,

Black is existing wall; grey is new plasterboard, mounted on 25x38 battens to provide a gap for pipes etc. It will eventually all be skimmed. This is a corner of a deep window ingo.

Question is, how best to do the bit circled in red to suit skimming? There will be a corner bead, which I think have 25mm sides, don’t they? (Can you get wider ones?) Options I can think of are:

- Batten right up to the edge, then try to skim over the batten - will the plaster stick?
- Set the batten back from the edge and try to fit a 25mm wide bit of plasterboard over the batten.
- Fix some plastering mesh over the batten.
- Set the batten back a bit and try to stick some plaster or other filler over it.

Any suggestions?

 

[Alastairreid]

Set the batten back and screw plasterboard to the wood.
The plaster will crack otherwise.
plenty of scrim tape between the p/b and existing wall.