Hi guys...sorry to leave you all in suspenders! Was watching the recording of strictly come dancing!
Hubby bought large board of MDF which he cut very snugly, he then drilled holes all along the sides and back approx 2cm from the edge. We then fixed the shelf by putting strong cable ties through the holes and tying them around the bars of the cage. the ramp was made using MDF, hubby bought two brass hinges which he attached to either side of the ramp and screwed to the shelf. As the screws were slightly too long and protruded underneath he used a small off cut of wood underneath so that the screws wouldn't stick through and cause injury to my precious girls.
Cannot tell you all how happy I am that they have more room now.
Good luck to you all with the renovations and ask if I haven't explained things clearly enough