There's really no need to make the passage into a floor door. After all, the first two doors have been breached, and the significance of making the passage a hidden door isn't great. If someone has already come in, how could they miss a door?
Moreover, turning the door into a floor door and altering the passage structure seems to make it inconvenient for transporting supplies.
Since no other modifications are planned, this blueprint for the main door can be considered complete.
Looking at the finished CAD design on the computer, Chen Xin couldn't help but feel a bit sentimental. This was a skill he taught himself when he was seeking his first job just after graduating from college. Over the years, he hadn't drawn any blueprints in a long time.
Originally, Chen Xin thought that after the apocalypse came, he wouldn't need to draw blueprints anymore. Yet he didn't expect to use this skill again so soon.
