I can't really offer carpentry tips but I can tell you what a CHEC unit is like (or in this case not like). There are not especially sound proof to be honest. I think just the fact that it is in a quiet location combined with the headphones made it quiet. Also as far as i'm aware they don't repel EMP either. I think if you do a booth session (like at Guidelines or booking a PREP session) then that unit is more sensory deprivation orientated. But even then I don't think that is the unit that the legendary Explorer sessions were done in which is lead lined and properly sound proof.

The simple CHEC units are just a bed sized hole in the wall with a thick black curtain to cut the light out. You have a set of different coloured lights to use if you want. Their purpose was never that clear. I think just intuition based (e.g. doing a healing exercise I felt inclined to put the blue light on).

The CHEC units at TMI are where you sleep at night. They typically have stereo speakers and headphone jacks, and a variety of lights. The big feature is that they can be darkened. Most are twin size, but some are doubles, actual mattresses. At first I was obsessed with total darkness. With practice it became less and less important. Now I can go out of body in a few breaths in almost  any quiet spot. No phones, no pets jumping on you, no kids yelling, no TV's, etc. The "isolation" part of CHEC depends on what you need to have your OBE.

The original explorers were done in a room with four CHEC units, what is used now for resident programs at the Nancy Penn Center. I was assigned that room (by myself) during my Exploration 27 program there, and worked in the unit where Rosie did her "Patrick" session. They are not lead lined, Farrady cages, or soundproofed. The lab has such a CHEC unit: EMF proof, sound proof, body temp waterbed, completely dark, etc. and you can book private sessions in them (there are at least two) if the price is right.

Thomas

ah k I see, practice makes perfect thankyou for your feedback,
One other thing while I think of it, to do a lifeline course at the munroe institute, one would have to be fluent in focus 21, is that correct, thanks
Paul.