I made up mine today out of fiberglass. I've got everything done except for the paint, the only gelcoat I had in the shed was grey/white. I'll pick up some black tomorrow. I took some pics but the computer doesn't want to cooperate with the camera, when my sister comes out this weekend I'll download them onto her laptop and post them then.
Mine is not adjustable however as I didn't want to drill holes in my laminate stock. I made a shell like SeamusMac (3 layers) off a mould made out of a piece of 2x12 with the top edge rounded over. I then built up the required thickness on top with polyfair, then covered it with another 4 layers of glass. I then gave it another little skim of polyfair just to make it smooth. I could pretty well use the cheekpiece for a target and still wouldn't destroy it, lol.
I noticed on one of the test fits that the bottom edges would stick out a little from the stock as the mould was straight and the stock is curved. So before I put on the final layers of glass I shimmed out the middle and pulled the bottom in using tie wire. It now hugs the stock perfectly, in fact it hugs it a little too well. It's a good thing once I get it painted and put on it's staying on because it ain't easy to get on there, lol.
Thanks for putting it back in my head to make one SeamusMac. I was thinking about making one for a while but didn't bother with it, all I needed was a little push to get off my rear and go do it, lol. I'll get some pics up this weekend.