A friend of mine has a flat in the top floor of a large Victorian house. There's a big loft above the flat that's accessed by a loft hatch in the hall, which is in the centre of the flat and under the point where the roof it at its maximum height.

The loft is horribly mucky with 120 years worth of dust and grit on the floor.

My friend wants to create a "walk in wardrobe" in the loft ie put in a decent wooden loft ladder and build a "room" centred on the loft hatch and effectively sealed from the dirty loft and entered via the loft hatch.

I envisage putting some kind of floor down and making a cube shaped wooden framework to which plasterboard could be attached, we'd then probably get it skimmed paint it. There'd be a light and a hatch in the wall to give access to the rest of the loft should it be needed.

The sides of the cube would be about three metres and the height whatever we can fit in under the roof.

Any thoughts, suggestions or ideas welcome - particularly on constructing the walls of the room.