I've acquired a 1960s terraced house and plan to fix up the walk-in closet. The room has raw walls, i.e., seems to be some kind of lightweight concrete or similar. Large gaps between the wall and door frame, no door trim. No baseboards. I thought of putting up thin plasterboards against these to get a nice surface. I then plan to install a clothing system on these walls. What do I need to consider? Note: Never done anything like this before.
Also, the ceiling is unfortunately of the time, i.e., ceiling tiles. Do I need to remove it if I want to put plasterboards on the ceiling?