Very sorry. I THOUGHT I had saved it as v2017, but misfired.
Here’s a 2017 version, which I’ve checked does open in 2017.
Camper Cad 4 angled front play with panel2 Make.skp (404.1 KB)
And the DC element of it does work if you click on the frame with the Tools/Animate action from the menu, or from the Dynamic Components toolbar