What I'm doing with the app version of A Book About Hype seems very similar to what you're trying to do.
The objects inside don't zoom. They just stay in their corners. To hide the title, as there's not enough space at smaller sizes, I use media queries to change the display of the element.
@media screen and (max-width: 550px) {
.title {
display: none !important;
}
}
The "Flexible Layout" setting looks like this...
The bar expands to fill the space. Elements can be hidden if there's not enough space.
There's the "Book" template, which is a close example to this...
https://photics.com/free-template-tuesday-14-tumult-hype-book/
I gotta get going, but maybe that info helps.