I like the idea of a wall mounted cabinet(s) - preferably at eye level. A few years ago I was visiting my mother. She has a friend who had two wall cabinets full of old toy soldiers. Although he was not an active collector, he was proud of them.
Apparently, he had the cabinets made to his specifications. They were great. Wide and not too long, they had swinging glass doors, and backs, and stood at eye level across from each other in entry hallway. The cabinets were not split in two by a piece of wood in the middle, which helped visibility.
Each was probably about three inches deep, so could not have held the bigger vehicles. But very nice for viewing figures.
The cabinets gave the collection an elegance and maturity that I have not always seen. They made the soldiers seem like modest little pieces of art, rather than "toys".
This was in a beautiful mountain house in a very well taken care of home. I dont know how much the cabinets cost to build, but it really was the best display job Ive ever seen - in person or otherwise. The owner is very well to do, and can afford expensive things. He is also works in high society world of high end art, and knows how to do things right.
That might the ticket --- if you could find somebody who'd do a bang uip job and not cost you an arm and a leg.