Since there's a new forums and there's no guide on how to make a fading door that meets server requirements, here's an extensive guide on how to make one. If someone asks you how to make a fading door, you can just link them to this.
Step 1: Own a building
Unless you want to leave your printers on the streets, you should own a building. Preferably a big building where you have lots of room to build on.
Step 2: Put up a building sign
If you don't want to be raided or mugged while you're making a base, put up a building sign. This means no one can raid, mug or steal from you, but at the same time, you can't raid, mug, steal, own a printer, or make pot.
Locate the 3D2D Textscreen
Customize your textscreen as you see fit. Remember to say that you're building!
Place it down somewhere that you can clearly see it
Step 3: Pick a prop and decorate it
Now you need to find a prop that you want to act as your fading door. It can be anything that you can place down.
Now decorate it (or not) and make it look as flashy as you want
Step 4: Make it into a fading door
Now to make it into a fading door. First, locate the fading door in your tools
Underneath the word "Fade" should be a big gray button. Press it once and pick a key on your keyboard to act as a fading door. I recommend putting it somewhere far from your controls in order to avoid accidentally opening your base up. Make sure that "Start Faded" and "Toggle" are NOT check marked (Unless you're making another contraption).
Step 5: Add keypads
Now that you've got your fading door, you need to add keypads. Locate the keypad in your tools
Now the areas I've circled are the most important settings you need to change.
Access Password is the keypad combination you need to put in if you want to enable your fading door.
Access Granted key is the keybind that enables the fading door. Make sure it is the same bind as the one you put in your fading door.
Hold Length is how long the door will stay open. You NEED to have it at a minimum of 6 seconds.
Now exit the tools GUI and put your keypads on to both sides of the door.
After you've done that, make sure that every single one of your fading doors work. Punch in your code in the keypad and make sure that the fading door stays open for at least 6 seconds. If everything works, you can remove your building sign and put up a KOS sign.
Congratulations! You've put up a fading door.