How to better visualize the off-line maps ?

Hi, It is more an idea than a question but I need to explain

Context :

I download maps to use offline for hiking. i select an area around where I am going and download it

Now, when preparing my trek, as i am connected (wifi/ data) it is somewhat difficult to see what exacly is downloaded

When I select a downloaded map, I see it, but where it ends is not totally clear. What level I have downloaded is unclear

Problem :

Result, in the middle of the mountain, i have some gaps.. e.g I only have level 11 and missing all smaller levels

Proposal :

I wish there would a way to display the borders / content of downloaded maps in a more visual way e.g by coloring all downloaded 'bricks'. a scroll would allow to select what level I want to see as this content varies on level

Crappy example of what I mean inspired by Brouter area selection

This would be for a unique Downloaded map, ignoring what is in cache...