Don't know if this helps, but DH ordered one at Mamma Della's for my birthday dinner - there were 16 of us, so he ordered a cake. It was beautiful (and delicious), decorated with Italian scenes on white chocolate pieces standing up on the top. If you're staying at PBH you could contact them - the manager was wonderful to work with in setting up our party.
Cakes can be arranged with 24 hours notice through the concierge. Rates
for an 8" Hard Rock themed spongecake start at $50 plus service charges and
gratuities.
Ouch is right ! - that's about what DH paid for my beautiful b'day cake and it had to be at least 12 - 14" - we all (16) ate some, (make that 15- DGrD was only 5 mos) and we still took a box of cake back to the room.