I can't play it until you do .. I will not fix up all the stuff you did wrong .. even though the screenshot looks very promising .. but I've been fooled by that before :-P
The Packaging Guide needs to be followed!
Make the package game-folder extractable - loose that top-folder it's currently inside!
Don't include your Readme as "Readme" .. call it "README_zone" .. you've included a dozen or so Thumbs.db files (not critical but they're cruft!) .. and almost all your skins have a .JPG extension - it needs to be .jpg to work cross-platform.

1) You´r custom textures are not tile-able, although they are supposed to be.

2) There´s a skybox-load error. Actually you need to disable the default skybox and you´d put the skymap into the package.

That´s the location in your config:

//loadsky "textures/skymaps/steini/steini2"
//loadsky "textures/skymaps/steini/steini3"
loadsky "textures/skymaps/steini/steini4"
//loadsky "textures/skymaps/makke/rocky"
//loadsky "textures/skymaps/makke/mountain"
loadsky "textures/skymaps/sniper/sundown1"

Much like meatr0me said... your map isn't cross platform, since linux is case sensitive, so my box doesn't load the model textures properly.

... and I really cbf going through all the files and renaming them to make it work.

Imo, the layout isn't really that great and some of the mapmodels don't fit in well the way you've put them there. They just seem like "space takers" rather than "space enhancers"