Not really sure what you're asking. Interior door? Exterior door? Every door is made from different materials. Solid core is different than hollow core. Some are fiberglass. But your basic water based paint works on most doors. Doors are usually painted in a semi-gloss finish as is trim.

Most regions have their own prevailing construction methods and materials that are common and customary to that region. It may be driven by the available raw materials, local labor and their experience with a certain type of construction, and the cost of labor to build. Other factors that drive the different type of construction can be pressures from the environment and climate conditions. One can create recesses in masonry or stone walls but there may be structural weaknesses that become a factor or just more complicated construction that becomes involved. Building recesses in heavy masonry walls verses light stick framed walls can be equally possible. Reducing the thickness of a wall can also affect the insulation capabilities of that wall as well as the structure.

I would get a coffee table similiar to the one in your other room. This area is small so I think a glass top for this room would be best. Try a round table with a pedestal. That would give you more leg room. Because all the cushions and the drapes have a pattern I think you should choose a rug with no pattern. A solid light gray would look nice. To contrast all of the smooth textures of the red upholstery and the dining chair's cushion, pick something with a high pile. Very soft! Change out the pillows on the sofas to a soft gray on gray pattern.

The type of door for bathroom is usually in my experience is a hollow core pre-hung door. Depending on your budget this is the way to go for they are inexpensive. But, for privacy reasons, install a solid core door or a door that does not transmit sound readily. Whoops :)))