How to restore heritage home interior wall render?

[Ben2065]

Hi everyone,

I am slowly restoring my heritage cottage (built around 1900). Current project is to install stud wall immediately to the right (hot water side) of the window architrave (dummy base plate of stud wall sitting in place). However the wall render has failed in much of the room from being used a bathroom with no waterproofing as you can clearly see in the pics. It has been exposed in the current state for years so has all totally dried out. Sadly the brick wall is not very presentable in its current shape for the consideration or removing the render. Also the plate rack, cornice and skirting all allow for the thickness of the render (aprox 1cm thick with a sandy thick base which crumbles easily and a top hard white skim plaster coat). Previously this had sheeting installed over it when the room was used as a bathroom (villaboard I suspect).

How to restore the wall?

Install villaboard on battens to space it off the bricks? 

Use acrylic or concrete render?

Simply board up with gyprock glued to the bricks?

Paint the bricks with limewash or paint and apply timber quad to all timber trim edges to seal the gaps?

The area where the hot water heater is will be a small enclosed toilet room

To the left will be a laundry area (only a few sinks to be installed) no shower etc. 

Looking for something clean and functional but doesn't need to be heritage perfect lime render.

Many thanks for your assistance.

[Dave-1]

Good Afternoon @Ben2065 

I was liking the idea of the timber or gal strips that @EricL and @Nailbag suggested. Tho the ones that @JacobZ has mentioned sound like they would be a lot easier to handle uneven surfaces. I think having a stand off wall wil look a lot nicer and be far easier then trying to render the whole lot and your moisture concerns.

Dave