I built a slideout for one of my pantry cabinets on the 3812 there are four of them. The inside measures 9 3/4" wide x 20" high x 30" deep but there is a exhaust pipe that runs thru it that takes up 4 inches of that in the back. I made this slide out 7" wide x 17 1/2" high x 24" deep with two shelves. Here are some photos of it. First shows with food in it, it was hard to find what you needed without pulling out about half of the stuff, second one is the new slide out and the last show the exhaust pipe. I can post how I made it if anyone is interested in trying it. The total cost was about $90. I may built for 2 more of the 4 the top one is so high I have to use the ladder for the loft to get stuff out of it so it holds paper towels and TP.