https://www.youtube.com/watch?v=gYxJt0uXr1YI totally agree. Proper structural items has been a slow drip feed over years. You wouldn't believe how tough it was when all we had was a few rough blocks and crappy planks!
Anyway, if this helps, here is a solution that many of us use. Take two wooden framed paintings and place them back to back to make your own door. You can set it to a semi-open position.
Jump to 1:30 on the video below to seehttps://www.youtube.com/watch?v=gYxJt0uXr1Y

Yeah, as I have said before (too many times!), there should be walls, or even whole modular rooms which can be connected together, with various variations of doors and windows already in them.