And, I (Think) got way better at mapping than before:
Spoiler:I have a great idea for this map, and in the process, I'm going to need to learn what is appropriate along the way.
Right now, I need advice for making a PROPER Polyobj.
I have a door I want to slide 64 units across. I followed the tutorial by Richard Clark to the teeth.
The door is in the dummy sector, I set the line, It's a 64x16 door, there's a 64x16 subsector next to the door
sector I set.
The anchor is set (Angle 1). The Polyobj_StartPoint is set (Angle 1). I run the test...
...the door doesn't appear:

(The potential door is sliding to the right. The sector is there).
Thoughts?