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don't where to begin.
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.
gbj_tester-
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.
ChasnotRobert
Is there somewhere that can help me "design" bike geometry?
I am casually considering a Marino custom fixie, previous experience was with a UK distributor (no longer in existence) who scaled up their default options on the mullet MTB to XXL proportions.
This time I would be flying solo and starting with no existing data.
I suppose I could measure my existing bike and try to scale it accordingly?
(Current ride is a Charge steel number, that runs a decent amount of seat post, and the toe overlap is less than ideal)
The details I need are in the following diagram, but I don't where to begin.
Well, I do know where to begin, the worlds friendliest forum!
I am 6'6" so needs to be big, also the fork will be a custom Marino too, so I need to settle on an appropriate ATC length.
Finally, the flavour of steel, 4130 is default, 520 or cromor are $20 extra and 725 is available for $60. I know nothing on the variations, so don't know which to choose.
Rough early estimate on costs would be around $600 / £470 (delivered, but possibly with import fees, haven't looked into it yet)
Is there a UK frame maker that could knock out a custom steel F&F for similar money? Thinking of this whilst typing out, so apologies for rambling and making a long post.