I'll bet I'm not the only person who has no idea what you're talking about. Do you have a photo, or can you describe what you mean by "hidden knee wall bed"?

Google is your friend!

Found a link to Youtube video about building one

https://www.youtube.com/watch?v=SIbpSnPuu_E

With today's modern insulation requirements, I'll bet that you can't have your cake and eat it too.

Thank you very much!

Unfortunately the video (which I had watched before and is exactly what we were looking to do) didn't have the dimensions. However from this and others we devised our own folding bed and have insulated. It is a pretty cool contraption (let's hope it works well.) If anyone else needs information on this - I will gladly post pictures and info.

How did it look finished?

Very nice. I will post a few pictures next week.

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