[Openflipper] How to create a custom datatype?

I would like to know how to properly create a custom datatype for use within the OpenFlipper framework. Currently, I am using a fudged together datatype, basically an inherited version of an existing data type (SplatCloud). However, it is becoming too limited for my needs and thus require the ability to properly define a new datatype. I have checked the online documentation and there is just a "To Do" place holder. Any help would be much appreciated, Adam