please read the packaging guide
I've posted this in every of your nodes ... this'll be the one place I'll go into more detail.
All your maps CFGs are exact copies of default_map_settings.cfg ... that's not necessary;
that's why it's the default .. so you don't need any CFG unless you require to load additional stuff!
And you really don't need to include the screenshot image in the ZIP either.
But those are just niceties and hair-splitting stuff actually!
Most importantly you should fix your directory structure so it doesn't take me 10 minutes to sort out the required files into my packages/maps/ folder!