Hello Lawrence.

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I understand your "old-school" project.

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My Radio Amateur's Handbook, the only one I have, is from 1965. I bought it in London when I was a kid. It really inspired me.

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You don't indicate which frequencies you're considering for your project. You're starting with 3 x 4-400C. You're considering a push-pull of 2 x 4-400C, which is very easy to neutrodynize using two cross-connected capacitors. This would improve stability and gain, even in multiband. At that time, it was common to install the LC output circuit directly in the tube plate circuit. This avoided problems with the choke coil. Of course, with a push-pull, output coupling can become a problem in multiband.

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Good luck with your project.