I edited this post because it was recommending the California Air Tools 1P1060S. However, that unit is only rated at 1.5 CFM @ 90PSI and we have not used it to make Aircrete (although we have it around the shop for misc little tasks).
@MADE Made, I'm happy to say that we almost never have problems with the pumps. I see that your pump is only 7 or 8 months old, so we will send you out a replacement as soon as possible. We will sort out warranty details with Aquatech later. -Zander
Well like I said he has redesigned the green dragon and is testing it. The problem with the original green dragon came from the difficulty to control consistent density. If the density changes to much you can get really bad results in terms of structure quality. I too want to make larger buildings and would enjoy not batch mixing.
If the clamps you are talking about are on top of the domed cover, then they are for holding the foam wand. If you are pumping straight into the hand mixer you are not using the hand wand and thus the clamps are kind of useless.
As to a a secure fitting bucket. Any bucket will do. I a have my littler dragon mounted on the 5 gallon lid that can in the kit and then mounted that lid to a 32 gallon trash can lid so I don't have to refill my buckets as often.