I've had a couple of setbacks. The plywood floor is not staying quite flat with the heavy load of the sofabed on it. Also, I think it's going to be prone to splitting along the two edges if they get pushed together. If you're thinking of doing something similar, I would consider 9mm or thicker (mine's 6mm). Also, MDF may be sturdier than plywood?
My board may be ok, but I won't know until I start using it. I'll keep you posted.
My background kit arrived yesterday. It's a Karlite one. When I came to hang it, I realised there's a plug socket right below where it will need to go, so I've had to buy an electric cable detector. Just hope there won't prove to be cables running upwards, otherwise I'm sunk.
The Manfrotto wall boom I've ordered has also arrived together with the Bowens Gemini 400 light I got to mount on it to use with a hair light. The light's very heavy. I'm unsure where to hang the boom so that I don't need to pull it out to it's full extension. Actually, the window is in the way! I sure hope all this is going to work...