Did i miss something or was all this thread in Inches.
Cyrille, If you wish to use a non standard brace hieght for a bow design then the string will need to be a non standard length.
but SINCE AMO or ATA states that the bow can be any length required. as long as a AMO or ATA standard string fits with the correct BH designed by the bow maker, then a 60" bow can infact measure 59". or 61". Infact measure a BW 60" bow, round the recurves, straight accross the belly, and round the next recurve. nock shoulders to nock shoulders doesnt make 60"... why, because it doesnt need to if it is to take a string suitable for a 60" bow...
Now, we took this approach with the hex5. but realised that the bow length would become more and more compromised, for string angles, and for this reason hex6 limbs make a bow closer to 60" long, but you will need a longer string to accomodate the non standard BH.
What is even more fun is measure a 17" riser end to end, and note its not a 17" measurement.
For example the DAS 17" riser is 16.5" end to end.