We needed a foam 1m. * 2m. * Thickness 8cm. (Density of 2545, but it does not matter what the density), the fabric we had 70 cm wide, about 5 meters, but if you take a width of 1.4 m., By my calculations need 2,7m., Insure take 3m, to accurately sure.
I would add that when you cut the strip to the sofa backrest and armrests, it is better to make extensions to 7 cm, so the fabric on the sofa will be more stretched on marginalia.
A pattern made from a cardboard box just two parts, they are necessary for me as for the foam and fabric. Foam carved stationery knife, slowly drawing in one place several times. By the way was a piece of foam where a 60 cm * 100 cm (child loves to jump on him, pobesitsya).
So, when all the details and to carve out of the fabric, too, all carved out and sewed, the sofa is contracted between the parts on hand, because it is more opportunity to stitch together saw (it was the most disgusting thing, because the child is already waiting for the sofa and the it raged).
According to my idea couch had decomposed forward accordion. But as I sewed three days in the evenings only, when the child was no longer up to the sofa (came Dad and all the attention only to him) and in the afternoon on it (couch) besilis even disassembled, the child is already used to it folding, not given I pull it syadushku in the form of an accordion. I just sewed bottom to the base of the couch, and the rest is left in the removable.
But here we find its advantages: 1. More small child sit on three pillows, so long as only two. And this is her size.