Epoxy even by itself is good. When I was starting out, I glued scales to the blade of one of my old kitchen knives, and then tossed it against brick walls, dropped it on cement floor from about 2m, and did my best to "accidentally" pop the scale off. Well, the scales stayed on, even when the tip of the knife was gone, and scaler were all banged up from hitting sharp corners. Since I don't think any sane person will try doing THAT to a cherished customized Spydie, I think epoxy by itself will do fine.
However, I think I'll try to do it with screws sometime, just for the looks of it. I really like the look of the rivets on the old G-10 Police, so I was hoping to do that sometime. Oh, and a lanyard hole with a thong tube too. Want that too.
I just need to find a place to buy green G-10. I'll settle for black G-10 too, but olive drab or green would be better...
Oh, and yes, scratches on the metal are the bane of my existance. I mean, once I mirror-polish the metal handle when I am finishing up it looks real nice, and small hairline scratches sometimes even help the look, adding character. But sometimes I want a flawless metal back, and that takes effort.
Sheaths work. They work well. I've been carrying a Millie in a moulded pouch with a flap, and a metal clip on the back, and it's just great.