You "fixed" your problems by converting almost all your func_detail stuff into models, resulting in a ton of unnecessary models and a map file that's three times as big as most. That's what they refer to in the industry as a "brute force solution". Models should be reserved for things too complex to be done with brushwork, especially in custom maps.
I'm almost positive there's a proper fix for what you had happening that'll let you replace those walkways, staircases, and doorways with func_details and still be able to compile properly. If nothing else, the dramatically decreased filesize will make people more willing to download and test the map. It definitely deserves to be tested more.