Unfortunately Purchas has arrived too early to bump into the painter Luca Signorelli who isn't going to be commissioned to paint his fabulous murals in the cathedral until a decade later.
Signorelli's murals depict the End of the World. They're full of muscular writhing bodies. Michelangelo saw them and they inspired his much more famous Last Judgement in the Sistine Chapel in Rome.
I like Luca's version better.
Check him out here