Britannia metal (sometimes called "britannia pewter") is nice stuff. It works and looks pretty much like lead, but with none of the drawbacks (i.e., extreme toxicity and deterioration). If you've got experience with styrene plastic you shouldn't have any trouble working with britannia. It can be cast, drilled, filed, trimmed with an Xacto knife, sawed with a razor saw, sanded, bent, etc. It takes any modern hobby paint well (metal primer, such as Floquil, is a good idea), and can be "blackened" with a chemical called "Pewter Black," which Bluejacket also sells.
The
Gambier Bay kit actually isn't very old. I don't know just when it was released, but it's still in the Bluejacket catalog. The company also sells quite a few additional fittings (including extra resin aircraft) that would be relevant to it. The website is www.bluejacketinc.com .
Hope this helps. Good luck.
Youth, talent, hard work, and enthusiasm are no match for old age and treachery.