I have a changing bag and it worked well after a lot of practice.

I thought the room had to be 100% light free. I developed in the kitchen, maybe not do this again!

I think I am super allergic to these chemicals. I noticed my mood deteriorating as well when I am around it, maybe this is concidence but I know this is really harmful and hence the reasoning for ventilation. There is no way I want to try developing under the stairs with 3 trays of chemicals!

Well now you have opened my eyes... I'll try and think where I can enlarge (although doesn't it really need to be dust free and free of vibration?)

Well I could enlarge under the stairs and carry the paper up to the bathroom which needs blacked out (What about electricity, how can you see?) Unless I can wire a safelight into the main light.