I'll be honest.. it took me around 3-4 hours to do mine with all the redstone and shit lol.... I don't know if I really have the energy to do it a 4th time (this was my 3rd skeleton mob farm). I may be able to help with bits and pieces but if you'd like I can link you the tutorial I used. I have it book marked because it's the one I always go to. He doesn't describe the wiring for the loot system but it's pretty easy and that I could do for you if you need me to. This is the tutorial I usually used. Edit So... More pictures!! Picture of my dome, built out of sand on top of cobble before I dropped it down into the water. Underwater view (Helmet has respiration III which is why it's so clear looking). And then here is a little video Trent recorded of me dropping it into the water before surrounding it in glass. I need to decorate inside of it still and figure out what I'm going to do with it after that, whether I'm going to branch off into other domes or just leave it be as a little show piece.