Great topic! Here are a few additional considerations that you might explore for additional information. The Society of Automotive Engineers, Aerospace Council has a Cabin Safety Provisions Committee. Several of the documents that have been developed relate to galley design and are being incorporated in TSO's and ETSO's in order to standardize the equipment throughout the industry. Here are a few of the relevant publications, if you can get a copy of them:
ARP695 - Galley System Design and Installation Criteria
AS8056 - Minimum Design and Performance of Airplane Galley In-Flight Carts, Containers, and Associated Components
AS8057 - Minimum Performance of Galley Insert Equipment, Electrical/Pressurized
Documents in development:
ARP8058 - Thermal Requirements for Airplane Inflight Food Storage Carts
For more information on the Committee:
Cabin Safety Provisions Committee (S-9) - Public Forum
Here is the link to the FAA TSO for galley carts (I'm not sure where EASA is their their ETSO at this time):
TSO-C175 Galley Cart, Containers and Associated Components