Can I safely remove these archway corners?

[reoreborn85]

Hi.
Is it safe to remove these archway corners to make it fully square? I'm 99% sure it is but i just wanted to make that 1% extra sure lol

They sound more hollow than the walls.

Also, what is the best way to do it? Is it just hammer/chisel it out or is there a way to unscrew it etc.
Sorry if this is a dumb question.

Ps please ignore the dodgy paintwork! We moved in last year and had to slap a quick paint on because the paint under it was BRIGHT pink lol We're just getting around to doing it now.

 

[blup]

They are probably plaster covered mesh, tapping and comparing the sound to adjoining brick/block work is usually a good clue

 

[Wayners]

Yeah. Probably.
Just metal mesh kit id guess.

I've removed a few

 

[endecotp]

Removing the curve is likely straightforward; more challenging may be making what’s left look tidy. How are your plastering skills?

 

[stevie888]

I did one a few years ago which included wee low walls on each side sort of key hole style.

The problem was that the beam that had been installed was rather sketchy. I wound up framing the opening with 2x6 wedged down onto the wall below the floor which beeefed the beam up and made the tidying up a whole lot easier.