Hi, So we had the same idea you did, and the disco-bed bunk bed cot will fit fine in bunk bed mode. You will have about 2 feet between the bottom of the bad and the edge of the tent (effectively making your 10x14 footprint and 10x10 footprint). We tucked bags and stuff into the triangular space between the tent and the wall and it worked okay. The kids like crawling in there. So we bought ours on a leap of faith and decided to actually sell used our brand new disco-beds. The main reason is that we were sleeping 6 people, and let me tell you, if you want to fit 3 disco beds in there, or even 1 full size and 2 kids size (we tried), it is super crammed and you don't have room to stand without tripping all over the place. It is possible but makes the huge spacious tent into a very tight space. What we did instead was bout really nice foam/air mattress. It was a Therm-a-Rest 10 cm thick one with foam and a self inflating option. Let me tell you these were a bit pricey but so worth it. They were comfy, off the floor, warm (cots are cold without a mattress anyway), and went near the edge of the tent so we didn't lose any space due to the slope of the roof. Any ways, I hope this helps. I am sorry I don't have the measurements for you. The end of the tent slope more than the front and back. If I had to guess after spending about 40-15 nights in the tent I would have to say that at 3 feet high the the tent is about 8X10 feet. Plenty of room for two disco bed cots, but NOT FOR THREE (don't make the same mistake I did). All the best!