Mine is the 12x37and mine is green(red on the hf website:
12" x 37" Heavy Duty Geared Head Metalworking Gap Bed Lathe
The toolchanger is based on this design
cnc-projects
After I started converting the dimensions to us, some of the dimensions were interferance fits so I began my own design based on his, As with most zoners its never done but it works very well!