Mr. Nagata,
The below link is to a product called Veskimo. They make self contained micro climates. The link is for a totally wearable self contained unit. You fill up the back pack with ice and a small pump distributes the ice water through the vest for up to 6 hours on a charge. If you want to go the suitcase roller unit route, they make a cheaper version where the cooler resivour/pump/battery pack can be placed inside the suit case. The umbilical would be hidden with a fabric tube. The bonus of this system is that you can just refill it with ice from wherever and pop in a fresh battery. I personally would not put the cooling unit in the PLS as it will weigh a fair amount and pull up and back on the PLS RCU. But by judging on your eye for detail, you will probably replicate an accurate harness and weight will not be a factor.
PM me if you want and Ill be more than happy to share construction ideas/failures that I used on mine.
Details, details, details.
http://www.veskimo.com/cooling-hydration-backpack-system.html
ABSOLUTELY LOVE THIS!!! WOW! you the man! you have stated how long you researched/finding parts and fabric for this BUT how much time did you spend sewing this masterpiece?? ive got a billion questions for you but im sure others will ask before me, like the neck seal, which you just answered. im looking forward to all your "next works". i actually clapped out loud for this projects results. "i bow to you good sir!!" :cool
Mr. Nagata. From my experience, I would test fit my suit wearing only a tshirt and shorts (no under padding). I could last about 20 minutes inside the house before I started to overheat. My only long term outing was walking around West Hollywood for the Halloween carnival. I wore a long sleeve Tshirt, Cargo shorts and my home made cooling vest. That set up worked well. The vest gave it the puffyness and provided the cooling.
Im not sure about the type of fabric you are going to use, but my suit is made out of white non breathable dense synthetic material. It doesnt breathe at all. So all the body heat gets trapped inside once its zipped up. On my helmet, I didnt get the chance to play with any sort of cooling and would just flip up the visor to defog.
LOVE the suits, great work on the Apollo in-flight coveralls. Just spent a lot of time photo documenting Jim Lovell's used set on Apollo 13 two weeks ago, it was amazing how much wear it had...
There used to be a company who made replicas of these two-piece suits, probably made out of cotton. I've handled my share over the years and seen several of the Apollo and Skylab ones. That beta cloth probably wasn't too comfortable.
FYI, here's Pete Conrad's set, from not so great shot I got a couple of years ago:
http://img.photobucket.com/albums/v214/willysmb44/NASA Jackets/PeteConrad.jpg
Where'dya get the NASA patch for the Mark IV? Was it custom embroidered? Come to think of it, I saw a similar patch at the US Space & Rocket Center. Did you get it there? I've never seen a white-bordered meatball for sale anywhere else.