Have you considered selling maybe just the conning tower pieces for those who wish to retain the standard deck, or already have another brass deck?
Yes I've thought about that and realize it's only fair to offer it separately. Since the set is in both .010 and .020 brass, I already have to run bulk sets of the .010 parts. I'll set up a bulk run of only conning tower floors. Then I can mix/match and include a casting to make a tower-only upgrade kit.