Finally got an email reply from Wenig, here it is:
"Matt,
We have a NEF Handi-Rifle SB2 right hand thumbhole pattern. For a machine inletted "do-it-yourself" thumbhole style stock and forend in laminated birch is $260.00 and standard grade walnut the buttstock is $190.00 and if you need a matching forend in walnut it is $40.00. This may also require a special drawbolt which could run $45.00. Shipping/handling charges are additional.
Thank you, "