...can you get enough of them to make two good sized nacelles?
Well, considering how he has arranged the "wings", in theory, he could "fake it" with just four. Place one under the front edge, just protruding and cover the end in some fashion (hopefully with a hemisphere). Place a second at the rear section, again, protruding a bit. If a "cowl" can be affixed to the barrel, so much the better. Repeat for the other side. The down swept "wing" hides the reality that it is not a single long nacelle, but rather two separate, shorter cylinders.
That's how I'd do it if the barrels are too short.
Sincerely,
Bill
Actually, Im planning to get enough buckets to make a 12-13 foot long nacelle under each wing, so the wing rests on top of the nacelle.