Active job

Built in wardrobe

We are after a built in floor to ceiling wardrobe in a bedroom. We have one already that we would like to copy the style of (see picture). It is framed, gibbed and plastered. We have purchased some doors to use, and have a rough idea but happy to get advice about best way it is constructed. Depending on cost we would also like to get the existing wardrobe extended up to the ceiling. Rough dimensions are 1500mm wide, 2730mm high, 600mm deep.