for aircraft my convention it the first letter of the day it was made(m for monday), + the last two digits of the year (19 for 2019) + the number of revisions it went through; then a nickname usually from german or spanish. so m-19-2 "Ente(duck)"
rockets are just names or places from various mythologies
Floor -6: You see a massive contraption with a monitor and keyboard on it, you press the spacebar and the monitor reads "Kerbal Forum Server. DO NOT TOUCH!" you go down the stairs to the next floor.
This sounds like a nice feature for the game, especially for those who spend time in the VAB and SPH; I would like to see a brightness adjuster along with this, so you can test out lighting configurations(which I like to mess with)
all that i have tested, including 2 year old markings. make sure it has alcohol in it, put it on the area, let it sit for like ten seconds and then wipe it off