Johnny, thanks, I have a Bleriot that is a tad large for me and a Hillborne that fits well. With 48mm vs. 42mm tires I can say the Hillborne is a more comfortable bike. I am not a fan of the very long wheelbase Rivs, the AHH seems to not be ultra long. I ride with Choco bars on both bikes and a high stem, but I do stretch out a bit, so not upright.
I originally had a Saluki but the 56 was way to big for me even though my 56 custom was not (both gone now), why I got the 55 Bleriot. The 51 AHH would be a better fit if I did decide to buy one.
I agree that the Hillborne and Bleriot feel very different.