Spotted...

6ft, but 35 inch legs and monkey arms.
next frame will defo be aroun 58-59 rather than 56-57. My road bianchi is 57, and I now know I should have got the 59, but you live and learn.

I'm 6ft and my inseam is 36 inches. And, similar story, like yours, my road bike is 57cm, bought when I didn't know what measurements I needed yet. It's set up reasonably well now, though.

Definitely custom-made FTW for people with odd measurements.