Put slats on top of the metal net? Almost our entire house is 2nd hand furniture. We've found that even IKEA has two tier quality: Some furniture is basically made of paper. We replaced a '60s sofa, a formidable piece of furniture manufacturering skill, with an IKEA sofa bought on 90% discount (the colour we wanted anyway was on the way out). Playing in it with the kids, we discovered that the side walls are barely attached to the rest of the sofa; they and the back end are very thin compressed wood cuttings. Other furniture, like our kitchen chairs and table, are solid wood IKEA products. Can't do wrong with those.