Mary, after intensely considering your cabinet idea ... I think Velcro sewn to a canvas cover/flap would work just fine for simulating a Cabinet door ... But would likely not contain heavier items under extreme acceleration or deceleration, depending on your shelf/cabinet placement ...

Thinking how we normally drive , we don’t usually take off like a drag racer, so cabinets/shelves on the front of the cabin would likely be the best place to put them , only because of the idea that deceleration ( hard braking, a more likely possibility ) would only serve to push the contents further into the cabinet ..

Cabinets in the rear , under hard braking would tend to empty themselves

, inertia carrying them Forward into the cabin ...
As far as How it opens , it would seem that putting the Velcro on Top of the door and opening it downwards , would not only expose all the contents for perusal , but you wouldn’t need a place to stick it , as if it opened upwards , or sideways ...
And then there is the “Decorative” idea where it doesn’t have to be just a canvas flap for a door ...

Giving way to the idea that you could do most
ANYTHING there to dress it up a bit ... Nice material , quilts , padded , buttons , ...... who knows ... probably a Gazillion ways to make a “silk purse" out of a plain canvas door ...
Just sayin’ ...