Hi Exlibris,
thanks for the explanation, looks great!
You have done allot of research in the past so I would appreciate if you could share the knowledge you have gained and if you were building a dedicated room yourself what material specifically would you use, thickness along with actual build process from the framing stage onward, I assume you would do the ceiling also.
If I recall you used cedar in your place didn't you?
Why specifically soft wood like spruce?
Thanks in advance.