Pm-ed you WW,
If you look under >Pictures/Videos
http://www.airsoftallies.com/pictures-videos-f21/what-i-drag-around-during-games-events-t1403.htmThere is also a Breakdown of the gun.
It is possible to combine Gun parts and Types, it is all based on what kind of facilities you have in order to be able to get the work done,
Just taking a AK outer Barrel and expecting it to fit into the Delta Ring, Lock Ring, and body of an M-4 without some major modifications, well its not going to happen.
You have to do the Research !!!
Know what you have for capabilities, and support. ( School Metal shop might be able to help, even though I doubt that the will be happy about seeing Gun Parts on the School Grounds ).
You have to have a solid plan before you start, if not you are only going to end up with Crap when you are done, and you threw a small fortune out the window.
Building a custom gun does not happen over night, it takes time, You could start tomorrow, and with lick you are finished by Thanksgiving.