There are several shapes and sizes of wide mouth Nalgene bottles that can be adapted and modified (USPlastics.com), ideal for mounting a breather cap or hose to atmosphere as well as aftermarket products. If the oil labyrinth effectively separates the oil from the fumes, you could redirect into the intake. Nice job. I'd prefer some way of inspecting the level and appearance of what's inside and a convenient drain.
The contents can reveal engine symptoms or the results of your operating conditions.
This could be inside. Cue the dramatic soundtrack:
Sherwood