I didn’t realize it was a brand name, my bad.micarta is a name brand that basically no one can replicate. However I've had great luck making homemade "micarta" using fiberglass resin. Do a you tube search and you'll find TONS of info.
My most popular knife scale is home made blue jean "micarta" I have also made knife scales from a deceased persons favorite shirt and made it in "micarta". I've personally made kitchen knives that are used daily in my home that shows no sign of wear! Do a search of youtube and you'll get tons of results.