You are going to have a lot of problems. You're sealing the concrete wall with the insulation? "I started with 1 layer of the 4” XPS over the ceiling and then covered all the walls with 1 layer of 4” XPS foam leaving 1’ of bare concrete at the floor on the exterior North and East walls)." What's on the other side of the concrete? Dirt? Or is it an attached house like a row house? If it's a detached house and it's just dirt on the other side, which seems to be the case because you said it extends 7 ft below grade, you will have a great deal of condensation and eventually mold. The concrete walls are not completely dry and sealing them the way you did allows no place for the moisture to go. Don't seal those walls off. "As for venting, no. It is a fully inclosed concrete box. Monitored humidity is a constant 70%." So the ceiling is concrete too and your entry stairs are over that? If so, no wonder you have condensation. On the other hand, you have the makings of a great wine cellar. I wish I had that. Depending on where you are, the soil temperature can vary quite a bit between winter and summer but you're in a cool area so you should be fine. If you have 70 percent humidity in the concrete room, why are you insulating with a vapor-proof material and then sealing off all possible avenues for the moisture to escape? You can't do that. What happens to the temperatures if you don't seal the ceiling and concrete walls and just insulate the walls exposed to the basement? I think you'd be far better off with that approach. If the concrete walls give you a stable temp, why insulate them? Also - the door is R10 and the rest of the insulation is R20? If you really want R20, put insulation on the door too. Otherwise, you have a huge section of your wall that has a lower R value than everything else and you will effectively have insulation of R10. To start, I would take down the insulation from the concrete and monitor the resulting temp in the room. It seems like you can actually get a pretty good temperature and perfect humidity with what you have, doing minimal work. Good luck.

IMO we need a bit of info . 1st what do you need in way of storage like how many bottles for sure. Why do you need custom , there are 100s of beautiful wine racks to be found that are not custom. Are you having a tasting space in the wine cellar. What is your style ?

edenchild, I bet you could find fancy stuff online or in an upscale sort of store if you wanted to... but just the basic stuff a local fabric store would have would work just fine. Most fabric stores sell felt by the yard in basic primary colors, some pastels, and sometimes some prints. Get it by the yard, it comes in different widths, but common around 36 or 44 inches, sometimes wider- then you can cut it to whatever size you need it and you don't need seams or anything to finish the edges. Don't get squares or sheets of the stuff, you got too much racks to play with that. If you want, you could pick something bright to add a wee pop of color to the shelf fronts while still being functional. Red would be traditional, but light or bright colors would be nice too. Cut the felt to be barely inside the depth of the shelves, draping over the front edge is a PITA and usually looks like tacky crap. But do be sure to leave yourself with a few inches of drape on both ends over on the width of the shelves, gives you shift room for bottle movement as they get added or removed from the shelf. To do this... and use a fabric tape that's soft and not a hard ruler or metal measuring tape... measure the depth of your shelf just inside the braces, and that's final. Then lay the tape across the width of your shelf, using a bottle in each slot to make sure the "dip curve" is accounted for, and use that for your width measurement. Also... you might not be one for chardonnay since it's a white, but since you like reds... watch your cabs and pinot bottles. Some of them have a slight taper with the bottle and it's better to store them punt facing out instead of the wall if you stack your bottles on top of each other. Again, vibrations can cause a slide, and better to slide into the wall instead of onto the floor.

We installed a bookcase on casters which, when rolled forward, provides access to the furnace, softner and water heater. It could just as easily be hinged. In our case we didn’t want a wall of doors so this provides the convenience plus adds an alternative function.