Just thought I'd drop by with a pic of the results of BHDA thus far.
If anyone else fancies giving it a go, I'd recommend softening/smoothing the knurling on the pin as it got stuck as I tried to attach mine, jutting out by about 3mm or so, and in the process of sorting out the last jut I fractured a small chip off one of the hinge joints (though oddly enough the relief of tension that caused let the pin slide right in)! It glued back on easy enough though.
Thank you so, so much for this awesome design, and for releasing it in BHDA - it's a vast improvement!!!