I watched the 40 minute tutorial video(it does cover windows) and realized a lot of things I was doing wrong, yet I still can't place a door. Note I'm building a simple house, not a simple spaceship, but it's mostly the same. I've got the general structure of the house as one hull mesh, with a total of 4 room meshes inside. Each room mesh is 0.2m inside the hull, and 0.1m apart from each other, meaning those walls are that thick, plus some space(I think 0.1m) above the bottom of the hull mesh. I haven't done the room voids yet.
I've placed a door jig but when I cut it, it doesn't place a door.PRE-EDIT: Oof, figured it out, I have to select the door jig, hull mesh, and room mesh for it to place the door. I only had the hull and door jig selected.
I too prefer the old ways, because it was far more accessible, though my ships were always pancake-shaped. I totally see how this makes better-looking ships, though. Maybe one day there will be an "easy mode" designer that does some of the more routine stuff(like placing doors and rooms/room voids) automatically, but can then be edited in detail using the current designer. That said, I actually enjoyed geometry in school.
EDIT: This is starting to irritate me. Had to restart this one simple project several times due to some issue I couldn't figure out. Last time, I restarted because I thought I had made the door too small to fit through - I didn't, I figured out during this attempt that you need two hull voids, a small one co-mingling with the doorway room void while slightly sticking outside and another stretching outwards and co-mingling with the door hull void. The attempt before that I restarted because of some issue with the interior door cuts causing a big grey box(possibly part of the hull mesh or room mesh) in the middle of the room. This attempt has a similar issue with part of either the hull or room projecting over one of the bedroom doors. It doesn't have collision, but it does block clicking on the door in preview mode to open(I'm using standard instead of autodoors).
Also, 10cm-thick walls isn't thick enough to stop you from sticking your face through the wall. A quick lookup says that real-life walls are about 12cm-13cm thick.
EDIT2: Almost threw this attempt out because a door decided that it no longer wanted to exist. Had to use a roundabout method to replace it: copied the room void that went through the door, scaled it down to fit the entryway, then Part->Make->Door, and the new room void is now a door. Which for some reason was an object with partial(not total) transparency. And there's a 1cm gap between the top of the door and the doorframe, that I don't feel like fixing it. My own RL bedroom door has bigger gap.
Now the house is, for all intents and purposes, a 2-person medium house, I've started adding models of furniture to the bedrooms. Considering that, for the most part, my 3D modeling experience is limited to the past couple of days of using SoH's designer, I'm a bit proud of the results.
Only problem I'm having now is doing models for the bathroom. I don't know how to make a bowl-shaped object, useful for either the sink or toilet. Also, is there a way to save a mesh to use for other designs? And also, a 20cm-thick wall still isn't enough to keep your head from poking through.