Here are some examples of stuff I've made using this method:
13mm adjustable spraybar and U-tube intake.
10mm ADA mini style set.
13mm Hang-on-edge drop checker
Custom 10mm sponge filter intake with removable strainer.
1/4" ADA mini style set for my Marina Cubus 0.9 Gallon tank.
Crazy 13mm sponge filter.