Advice Needed on how to repair another damaged corner please

[EvilJ]

Hi everyone again,

So I'm in the process of renovating my dining room and this involved removing two metal mesh formers that used to form a curved arch between this room and the kitchen extension.

This former had been plastered over by the previous owners on the kitchen extension side and so has left a large drop between the plaster in the kitchen and the lintel.

My plan was to mount a stop bead underneath so this would hold the hardwall in place and then skim over it at a later date but I'm having trouble mounting the stop bead to the lintel. I even mounted offcuts of angle which I bent the mesh so it wouldn't protrude but I'm not keen on this idea either.

Any thoughts would be greatly appreciated.

 

[PrenticeBoyofDerry]

If the basecoat needs holding up, I would suggest it needs knocking off.
I would be tempted to remove it if it is shot at, and dot/dab plasterboard to underside, level with the vertical drop of wall. Leave to set then render/base coat between existing wall above opening, then thin coat angle beads, then plaster finish.