Most I've seen who do this, beneath the granite top is your fridge, same temp ranges as a normal chocolate case but built like a lowboy. So you have a few for show and the rest tucked away. Some have a top to the case and then you can get airflow and keep that part of your display cool as well. Then you don't need to transfer for night storage. Those like Frans who just have a plexi shield up are constantly restocking the little trays and I'm sure they put things up at night.
I haven't understood how you do volume sales like that. We have a rather standard built AA Fixtures case and when the season is hopping we are tearing through that case like chocolate fiends. If I had to duck down and pull out product my back would be broken.
We also run our shop rather cool, 67-69', the cold case is holding at 65' so really we can hold truffles in our kitchen for quite some time and end up doing so for a few days as we finish bulk runs.
It's really all in how you want to be perceived. I like the idea of having just a few of something out, it gives a little more focus and for some reason seems high end(?) but on an efficiency side I just can't see operationally how you rock through a peak sales period. Each of our trays in the case can get stacked I think 64+ units, easy and fast to draw from and multiple people can be in the case at the same time.
AA Fixtures will make that kind of case for you, I think Federal will too, but since it's not standard it's going to have some custom fee associated I'm sure.