Honestly, if you go check over in GBU, you will find that Chestnut Ridge might not be the best source for your needs.
If I were to recommend an aftermarket kydex sheath, I would check into Kiah, here,
http://www.bladeforums.com/forums/forumdisplay.php/833-Kiahdex-Sheath-Systems.
He's a BFC supporter, and does some great work.
Also, check out steelnut here,
http://www.bladeforums.com/forums/forumdisplay.php/862-Steelnut-s-House-of-Twisted-Kydex. Some more fantastic work.
Not to mention, any one of the numerous BFC kydex benders.
As for micarta, you won't find a better fit than the factory Kabar micarta, which can be found online at lots of places. My favorite rhymes with Nomar's.
Good luck, and let us know how it works out.
Moose