Plasterboard over serving hatch

[OldKettle]

Hi,
I am planning to batten and plasterboard a kitchen wall, which has a serving hatch in it, using 38mm x 38mm battens and 12.5mm board.

The hatch is 600mm x 990mm so I will not be able to get the battens on 400mm centres, and I am wondering what the best approach is.

Is there are acceptable way to batten around the hatch? (I have sketched out some ideas I had below) or do I need noggins across the hatch?

I have been advised to put 9mm OSB under the plasterboard to provide firm fixing points for cupboards etc. If I do this, would that provide sufficient suppport, even if I just batten like idea A below?

Any thoughts would be much appreciated.

 

[bobasd]

to answer your question - use 1/2" ply and 1/2" plasterboard.
remove all the trim and set a frame of say 50mm x 40mm backing pieces around the hole with say two cross noggins.
set the frame back one inch on the kitchen side.

is that a masonry wall or a stud partition?
i dont understand your ABC?
presuming your going to remove all tile from the surrounding walls?

 

[OldKettle]

Thanks. Much appreciated.

It is a brick wall, I am planning to just remove the tiles as needed to enable direct contact between the battens and the existing plaster. With the ABC I was trying to show idea for how I might batten it, the red bars being battens.

I am not clear on the suggestion of "50mm x 40mm backing pieces around the hole". Do you mean 50mm x 40mm battens, framing the hole, something like B?

 

[bobasd]

set the 50mm x 40mm frame back one inch (leave a few mm's extra for skimming over) - so the backing frame is set back in the hole.

you could always brick up the opening and solid plaster the patches on either side of the wall.