Originally Posted by
GreatWyrmGold
Since the Imperial system doesn't think anyone would want to convert between units of volume and length, I also feel the need to point out that 30 gallons is slightly more than 4.01 cubic feet. The closest thing to a mention of other materials needed is saying that the skin forms itself, so either the blood golem is mostly skin with just a couple dozen gallons of blood in the middle, or they are kinda small.