I live in an old house in europe that generates dust like zerlings in stacraft. In NON_STOP. It's one of those old fashioned brown half wood houses so i can't even imagine how people live in those ikea-like sterile houses WITHOUT dust.

So i usually keep most of my toys/action figures/lego sets in boxes and rotate the collection on my open shelf near my PC, switching stuff sometimes.

But i want to finally display collection openly and make cool action scenes and stuff but the dust problem makes me not to do so.
PS:
I mention europe because products here will be different from what you can get in states i assume.

Question 1: Is picrelated good for dusty houses? I see such things on Amazon for around 150-160 euros

Question 2: May be stupid but how do you take care of dusty displays? How often do you clean it?

Question 3: Will dust slip through any cracs and make displays dusty anyways no matter how closed they are?