good idea but an easier way to do that is get a bowl from a head shop and put a tube on it, pen tube will do then seal it if it isnt a good fit, then insert the extended bowl into the cap of a 2 litre, screw the cap on. burn a hole in the bottom of the 2 litre for a drainage hole, now sink this in a bucket filled with water.

throw your weed in the bowl, screw the cap on, pull up and light and as you do the smoke bubbles up from the tube

this way you get nice tasty bucket tokes that are easy on the throat, seems like you would need a lot of lung power to clear your contraption but is still a pretty good idea