I didn't try the forend. All I was interested in was the thumbhole sytle stocks.
As far as taking off the butt stock, you just unbolt it. There is a bolt that runs in from the back. You have to remove the buttplate then you can access the bolt. I don't remember if it was a hex bolt, or a slotted. Something makes me think I used a long slotted screwdriver to remove it. Either way, it was super easy. Just the one bolt plus the 2 screws (cross) you have to remove to get the buttplate off.
Hope this helps,