Doors – Do all sliding glass patio doors come pre-assembled in one piece

Your idea is possible. It will take as you may know already, a custom metal fabricator who is certified, to build to insure all welds will hold up under the weight of the assembly, since it will weigh hundreds of pounds. Using aluminum to make the base, sealed bearings in proper housings for the pivots. Counterbalance filled with lead to ease its operation, and solution to help lower the door in place to keep it from slamming down, like a gas filled piston and rod, like a shock absorber. an aluminum mesh, spot welded in many places to give a way for the tile to bond to the plate that makes the face of the door, with a perimeter angle to dress up the edge so you do not see all the layers at the edge of the door. With all this done, it will need to be powder coated to keep the contact with cement based products separated, so it will not corrode. Your biggest problem will be with your counter balance. When the door raises, it will drop in front of the door. It may be better to use springs or electric lift mechanism, or hydraulics. I made a small sketch to see how it acts together with a counterbalance.

This is by no means a complete sketch, it is missing reinforcements, the hinge pivot is off,etc. Just a picture study on feasibility.

In my opinion a lift system like that is on the rear gates of SUV's is a good way to go, although, should one of them fail....

There is no code that tells you that your bedroom doors need to swing in for a bedroom. But it is usually not a good idea for them to swing out.

• as you mentioned the doors present an obstruction in spaces. In hallways it might even be comical to wind your way around 7 open doors from both sides.
• when you are talking about privacy the doors have swung in because of the hinge side would be protected. For instance if you locked your door and the hinges were out someone could just knock the pegs out of the hinges and release your door.
• and safety wise there is always a chance that someone will open a door on someone else. But not many people stand next to the door in their own room. But people could be passing by where ever and you could hit them. This should be thought about in your case.
• aesthetically speaking you will be showing the hinges on the outside. I know it isn't a huge thing but a small design factor.

I have to say I have finished maybe close to 50 basements now (got to be close) and one of my favorite designs for a smaller basement is simply storage room with the bathroom towards the front and the other side is huge living room with an "extra" room with french doors in the back. Extra room is big enough to house a pool table but could easily be converted into a bedroom (often we have a walk-in closet going from extra room to storage room). We usually have the French doors swing out to the living room. If the living room is small though we swing them in. This is highly dependent on what you feel is going to be next to the French doors on each side of the room. (On really small rooms we use double pocket doors)

Another note: Come to think of it the doors themselves play a big part of inside or outside. If I have some nice doors - especially the wooden vintage french doors we clean up - well these open out. Because we want to showcase the door. If it is some big box generic french door set, we hide them in the room.