Note: Some of my images will show 3-4 servos. I discovered through trial and error that the AA batteries will really only support a load of 2 servos. If you're going to plug your project into the wall, or use a larger power supply you'll be fine with 4 servos, but with the AA battery pack you'll want to stick to just 2.
Use the included standoffs and screws to attach the Circuit Playground to the Crickit. Plug the servos in to servo ports 1 and 2.
Use copious amounts of hot glue or contact cement to securely glue the servos into two of the servo slots on the 3d printed case. I ended up using the two that are more in the center of the case.
Time for some wire management! Hot glue the wires firmly around the inside edge of the case, making sure the USB / power port is clear and the light pipe holes are not blocked.
Nestle the whole assembly into the case. You may need to bend out some of the legs just a bit.
If it's not fitting, you can "cheat" a bit with a heat gun to soften the plastic until it fits perfectly.
Add some more glue along the top edge of the servos. You really don't want them shaking themselves loose from the mount.
Find the long straight servo horns. Use a power drill to widen one of the holes on either side so that your 16 gauge wire fits snugly through.