The difficulty can be in finding a big bed in Egypt and some of the styles on offer in the shops are quite old fashioned.  I had our bed made at a local foundry where they made something from a picture I showed them. It cost us 2000 egyptian pounds, just over £200.00   We got around the limited mattress size here by buying 2 single mattresses.  The top picture is of the Hotel El Moudira on the West Bank in Luxor.