You can get 15 fun and useful project plans for the G0704 / BF20 mills.
Included are


3 Stage Air Cylinder
4th Axis
5th Axis Head Rotary
ATC 4
Chip Tray
Drawbar Wrench
Home Limit Switches
Light Duty Power Drawbars
MAD Drawbar
Optical Home Limit Switch
Spindle Tramming Tool
Spindle Upper Spanner Wrench
Tramming Aides
TTS Power Drawbar
Vise Grip

Get more info here.
G0704 Projects 15 Download
Hoss