Weve had a conversation about it already.
Its not a single click. Its hell load of work as far as i understood AND it would make a completly new map (from technical point of view), so people would have to download it.
Not mentioning the eventual (idk if needed or not) permission from author of this eagle map, permission to edit his work and use it edited.

Core wrote:

If only someone could just edit the map and make the glass phantom (transparent for bullets).
It's probably just a single click.

True, but ithink that would never happen, mapmaker has stopped playing as far as iknow