I looked through your design matrix
1. Everything must be designed to used by one hand, This is the major problem in any heavy weather
underway. Hence a lid that requires you to hold the bowl to open the lid with another hand is going to be an issue.
2. food never stays around long enough to need a lid in my view, but one that could be operated by one hand , i.e. a handle with a thumb button to open the lid. would be useful to stop spillage,
3. suction bases not a bad idea. unit needs to be weighted so that centre of gravity is low, even with food, major problem is bowls sliding to the fiddle ( side of the galley
table) and then because full , weight is high up, the tip over the fiddle. grrrrr. ( i.e. need wide base ) , modular bases would be useful as would a range of attachments to allow bowl to be fixed to things.
4. high sided to stop stuff slopping out
5. some way of being able to "dock" the spoon ( its always always a spoon) quickly , rather then dropping it , and spoon on an attached lanyard would be good. Cant remember how many times Ive chased spoons around the cockpit
is only needed to stop burning hands, not keeping food hot IMHO.
7. needs to easy to clean , i.e. good rounded radius , no protruding sharp edges, anything metal must be suitable for marine environment
best of luck in your endeavours