Frame and plaster in aerated concrete house

[trafe]

I have bought a house built in 1956 with lightweight concrete, siporex. Large elements. Now I'm planning to put up studs and drywall, is there any point in doing that at all? I'm thinking of placing insulation directly on the lightweight concrete wall and then drywall on top, do you need to cover the insulation with something?

 

[SBH]

I would arrange it so that the insulation is not against the lightweight concrete.
Then there is cellplast with a glued plasterboard on it, which could be an option.