One other thing - if I knew it would ONLY ever have the ZDZ, I would probably try to heat up the cowl, and form it around where the Bisson is lower, sort of a cowl bubble. It's not very much, and could possibly be done. I have done so in the past, with great results. But then again, I would be tempted to make it a two piece cowl, as well, etc, etc., and probably extensively modify it, for a cannister, as Dick Hanson is doing.

But, this one is all "Fly, Baby, Fly"!!!