I just looked back at my review of the Plaza a couple of years ago, to see what size the shelf needed cutting to! I had already measured it in Pip's cage, but not sure how accurate my measuring was with all the stuff in the cage. Anyway it was the same 18.75" wide to fit the inside bars (and 25cm deep). So all I need is a piece of pine cutting that size and some fixings (and OH drill to make small holes for the fixings). If I decide to do the same again - but maybe I should do something different this time. I just got so used to the long shelf in the Barney!
Savic Plaza dimensions and review