My neighborhood has a consignment store for surplus/unused construction materials. I found 4 (never used) double pane casement windows that are fairly large for $20 each. I plan to double them up (2 windows per opening) to make quad panes at each window. Hopefully, that will work well.
For the ventilation, you can make your own exhaust port that starts at the top (interior) and exits at the bottom (exterior.) Then put a large slow moving computer fan at the bottom exit opening to draw air. Newegg.com has dozens. Shop for the larger fans that are maybe 100, 120, or 140 millimeters in diameter to fit your vent port size. The ones that run slower (like 800 or 1000 rpm) are usually the quietest. The slower, the quieter. The faster ones do move more air but some sound like a shop vac. More vents can always be installed later if needed.
Just about all of them run on 12 volts DC, so a proper sized wall-wart can easily supply that. Many of those computer fans have three or four wires now-a-days. Two will be for the DC current. The third is an rpm notification wire for the motherboard. The forth is so the motherboard can regulate the speed or to turn it off completely when not needed. You can just cut the third and forth wires once you know which is which. Or better yet...shop for less wires.
