So many questions...O.K.; The green micarta used on Bowies is green "canvas" so it has the Grainy look you are speaking about...Yes!
The coolie cap has thin spacer between the micarta and the butt cap...Yes!
The Randall shop charges (I think) $35.00 for an order change...Yes!
Does that cover it? If I forgot something just pipe back in!
Hope this helps.
Best, Capt. Chris

P.S.: Oh yeah: The green canvas does indeed have an "olive" coloring. (Seen here on a pair of "Stanaback's") Your finished handle color and "grain" will resemble these...CCS