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Is there a UK frame maker that could knock out a custom steel F&F for similar money?
Pretty sure you are looking at north of £1k for a UK made custom frameset. Quite a bit north, for your more artisanal metal gluer.
OTP steel framesets made in Taiwan are going for £600+ so £470 for full custom looks surprisingly cheap.
Start with your contact points and work backwards. Steal freely from known-good designs. 4130 is fine, you're building a gate so you'll be stiffness-limited, making the slight strength advantage of the branded alloys irrelevant.