This frame is True Temper OX Platinum, but future Tephras will more likely be a mix of Columbus Foco / Dedacciai air hardening tubes. Supply is better and they're dimensionally more constant.

As for the geometry, it was a lot of research basically. I got fitted by an ex Olympic champ here in Melbourne ( John Kennedy ) who has fitted a LOT of people and is a cycling physiology specialist. He's a tall guy himself which I'm sure helped, but to be honest, the numbers he came up with and what I concluded myself were very close. *pats himself on the back*

IMHO the way custom geometry is going is based purely on the CG/Wheelbase equation. The numbers you get to based on this is pretty much just an outcome of these two factors. In effect, what we are doing is in a way pulling the BB forward rather than 'lengthening the stays' or 'slackening the seat angle' or anything arbitrary like that. It's complicated and 12:25am and I'm back from partying *laugh* so I'm probably making no sense, but basically the important parts - where your feet, arse and feet are - is actually not a lot different to a 'regular' bike. All the physical 'fit' is still there - it just fits me better phyiologically as a lanky guy.

Having said that, there are a lot of 5ft 9-10in guys riding around here on custom bikes with 71 degree seat angles and long stays, so there's a definite paradigm shift going around.