3B and 4 are stout barrels. A #3 is plenty, 3B max.
BTW, I have ordered the parts and now playing the waiting game for essentially the same blueprint and for the same purposes. I went with a #3 after mulling over it and the 3B for a while. Beanland is building mine. I agree with you on the BDL bottom, I went with Hawkins BDL.
