Nice work Lionelski. One of my motivations for doing similar projects is that you often cannot buy the parts for these items for less than a potential selling price. A pair of those postwar AAR trucks (especially with working operating couplers) is going to be at least $10.00 from most parts vendors - provided they even have them.
Here's an idea for your consideration if it suits your thinking: I often browse through toy departments and check out bubblegum vending machines for small figures that are usable on our 0 gauge trains. I've got small Disney, Looney Toons, SpongeBob and Minion figures that are suitable size wise. It's been a while, but I've bought these figures for 50 cents out of vending machines. A couple years ago, Walmart had blister packs of Minion characters... a topic that got some attention here on the forum.
If Lionel made one of these cars with Bugs Bunny figures on it, they'd be selling them for $80-$90.00... a far cry from the $10.00 you were asking. Never mind that train cars with these figures on them are a real crowd pleaser, especially with kids.
I recently took a Pepe LePew figure that I got from a pencil, where his tail was wrapped around the pencil. I mounted the figure on the train table with his tail wrapped around the funnel of a smoke unit instead of a pencil. When I throw the switch, smoke rises from his tail. A simple operating accessory that takes up very little space on a layout, and yet still gets smiles from visitors.