You could take one of the twin beds & break it down. Put the frame under the other bed & the mattress on top of the other mattress. If you have night guests, just flip the top mattress on the floor. Or maybe make bunks out of them. There is a way to do this. Also, if the two dressers are the same size, you could put them back to back & make a cutting board on the top. That way you would have a lot more room for your sewing machine.