Anyone building this type of cellar would be well served by getting Richard Gold's book on the subject. Also cork flooring is a very good option in the cellar. Cheers

Since you are installing a cooling system, it suggests that the temperature without the cooling system is warmer than desired. If this is correct, then the best thing you can do is insulate all the surfaces with the highest R-Value insulation that you can afford. The good news is that the floor will have the coolest temperatures of the six surfaces in your cellar, so if you don't insulate the floor, it will have the least thermal impact on your cellar. By way of example, I used our thermal load worksheet to calculate the thermal load of a 10x10x10 cellar assuming R25 in the walls, R30 in the ceiling. 85F peak temp outside the cellar. and 55F desired temp inside the cellar. If I assume uninsulated concrete in the floor, the thermal load of the cellar is 3005 BTUH. If I assume R25 in the floor, the thermal load declines to 2765 BTUH. If you'd like me to plug in your actual cellar dimensions and/or want to add additional factors (eg ducting, heat source inside the cellar, altitude), let me know and I'll be glad to redo the calculation. I hope this helps!

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.