Hi Stevie My suggestion came about from the picture from Graclo with a reply from Graeme, it all looks a bit old but particle board is a favourite rep ...

Vacuum the dust out and soak that particle board with a diluted Bondcrete mixture to seal it up. 60% Bondcrete and 40% water, paint it on, let it soak ...

I wonder if one can purchase the aluminium brackets used to support the tropical roof or whether they have yo be personally constructed.