Here's my first model!
It is for a variety of holders for N20 gearmotors. It takes an N20 gearmotor and puts an oobb compatible set of mounting holes around it.
This design is hosted and updated on github, take a look there for any changes, or if you'd like to customize or contribute.
https://github.com/oomlout/oomlout_oobb_holder_mechanical_motor_geared_n20
The author marked this model as their own original creation.