Motorhome shower tray removal?

Can anyone help me with how to remove the shower fittings from my 2007 Ace Genova. It is the shower with the sink integrated into a folding shower door and the same shower was fitted to other models in the swift range in the early/mid 2000's.

I need to remove the shower tray because it has cracked due to a lack of support underneath near to the toilet. I think this may be due to a floor problem but having removed the toilet I'm not sure as the floor is perfectly sound under the toilet.