Hi Arachnid,
.....Too simple?? I had a look at the link and would not underestimate the difficulty of executing this take-down system in an accurate and functional fashion......Before i looked at the link I would have elected this system as the one I'd be most likely to adopt if I ever converted a one piece to a two piece, but I would not be expecting it to be a boring 'walk in the park' at all. Do so at your (and your bow's) peril :D :D :D
I made a 'pickhandle takedown' as my first bow
with the metal sleeve method - fabricated my own steel and brass components and the project was a success. The sleeve assembly does not offer the same freedom to shape and personalise the grip however - you end up with a straight grip of oval cross-section and seems more at home on straight limbed self-bows perhaps....
Keep us up to date with what you decide mate and how it all goes