For the door, we bought some PVC pipe and blackout curtain material that we made two makeshift quarter-circle drapes out of. To mark where the drapes were going to go, we held a Sharpie against the door and let it mark the ceiling as we opened and closed it to see the area the door would need to travel. We ended up having to break the pvc pipe in a few places to get the curve we wanted, so to hold the pieces together we threaded some rope through the pipe and then rolled the curtain over to lock it in place. We then screwed the pipe into the ceiling with drywall lock screws and attachments and attached the sides of the curtains to the drywall by screwing them into some spare pieces of board we had laying around. Against the bottom of the door we attached a weatherproofing strip so that no light could leak in through the bottom of the door, where a large hole had been chewed by a mouse at some point or another.
There are a few remaining things to be done, such as the red lighting arrangement and storage for the chemicals, but those will have to wait until my shipments of these materials arrives next week. Once the floor and vent are installed and all my materials arrive I'll be ready to start making some art!