Need some help with my skimmer.. pics

[maimz]

..im also doing up a diy skimmmer....i pretty much think that i have things under control as far as design goes..but im unsure on how powerful of an injection i should have when pushing water into the skimmer.i mean i am figuring that i could probably get away with an airlift design but i am unsure if that will pump enough into the skimmer as i dont know how crucial this part of the design is to the functionality of my skimmer..and as well the main thing holding me back is at what height i should inject the water into the skimmer in relation to the distance from my airstone as well as the distance from the collection cup..any suggestions will be great..merry christmas.