Might be a long shot but if anyone is interested in an altitude generator I'm looking to sell mine. It goes to about 12,000 feet of simulated elevation making it great for intermittent hypoxic training as well as sleeping.
Mask is Altitude Tech's top of the line unit which includes a humidifier to keep your mouth from drying out.
I can build you a tent to your specifications if you like.
More pictures or details upon request. Located in Greenville, SC and would prefer someone nearby to meet in person, but willing to ship if needed. Asking $1500 but open to all offers on this in the interest of a quick sale.