Multimedia networks system

I Need to build a multimedia networks system having multiple video out of vga, hdmi, bnc and video input terminal of bnc as well as LAN for data and internet, audio output terminals of xlr, bnc and speakon . I need a design for a large conference hall of about 480feet by 480feet with about 50 terminal boxes installed at intervals of 50ft maximum round the hall. Each terminal box bears all the media interfaces (terminals). I need a design that will cost less to implement and that will ensure there is no loss in data, audio and video quality . More information will be made available later.