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That Omnium drawing has 72 degree head and seat tube angles, though I expect @t0-ster has the actual angles written down somewhere :-)
Are you going to get the brazing torch out and build one?
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More likely the TIG torch, but yes its on my build list!
I was working to either 71 or 72ยบ too, but I'm trying to decide whether to build a fork or use something off the shelf. BMX forks are traditionally around 32mm offset (though that seems to have changed recently), and I think I've found some carbon forks with 45mm offset. But these both give quite low trail numbers.
Other option is to pick 'the right' amount of trail (anyone?), and build custom from that.
ooooh, very nice Pete, what angles are you going for? I'm currently drawing something up too and trying to figure out what is going to feel the least shonky.