Here is a corona which goes over a bed. It is made from chip board . It measures 118 cms across the back and 60cms from back to centre front. It would be suitable for any sized bed and needs to be firmly fitted to ceiling or wall as it is heavy. It needs screw eyes around the front edge to hang the drapes on. I do not have the blind or drapes but could look nice with a blue roller blind and voiles from somewhere like Dunelm
Alternatively it could be stripped down and the board repurposed