this is kind of cage is rather common but you need to get some those plastic where you place it for the toilet with holes for him......if not his feet will get caught that is what i fear..
thought you let him go often in lawn you have to be careful as they are really fragile....
hay bowl you cannot prevent unless you buy those attachable to the cage which i used for my bunny..
you put higher but then again it cannot stop them from jumping up...
mine jumps up all the time...