Volks,
No offense to Bus Depot--but my proven solution for
a  cheap, effective sliding door screen is a good way to go!
When camping, I go in & out of the van very frequently.

With my simple modification, you simply slide the mosquito
screen open & closed, quickly, no snaps!
Quick & easy access in & out.
And the whole project looks great & can be fabricated in
a few minutes for just a few dollars.
Phaedra