Johan: If the Panawal has aluminum pins, I think your handle job will be better if they're replaced with threaded steel. There will be more surface area to grip the wood and tang if you get a tap and thread the whole shootin' match clamped together, apply glue everywhere, screw and clamp, and work the wood and steel to final shape LAST, then finish.
Golok: Even as a non-collector, I like Johan's collecting approach. Unless one has the resources and space to buy everything that comes along, doing a little homework before forking over the cash will give you a more pleasing bunch. There are actually hundreds of styles, so it's a big committment to try and get one of each. With countless handmade variations, it can't really be done, so my suggestion is to get the ones that you feel like you've just GOT to have, and the rest will take care of itself.
As a user, the handle shape is most important to me, along with the location of the raised rings. If the handle is wrong it will never suit me. Unless you have the opportunity to see lots of them together, you're stuck with trying to describe what you want to the seller. Once I understood what works for me, it wasn't as tricky to do as I had thought. And without a great knowledge of khukuris, one is better off buying from a reputable dealer instead of risking the unknown.
Going out on a limb here, khukuris to me can be like musical instruments and females. When buying instruments there are many technical things to consider, along with sound quality, volume, responsiveness, playability, and so on. Even so, it all comes down to two things: 1) does it stay in tune, and 2) is it so excellent that I just can't let go of it? That test will take care of everything. As for the other, as a local saying goes, "Pretty is as pretty does."
Later....Dan