Bought a Theoben Mk. 1 laminated Field Target stock off here a while back with the intention of putting a Mk. 1 R7 17 action in it.
Then discovered only an early action with the Gold Medal Trigger would fit.
On a visit to Custom Stock (local to me) on another "mission" I happened to take the stock along and they kindly machined out the rear of the inletting to allow any Mk. 1 action to fit ! Early or Current.....Brill ! They also had to take a bit off the back of the trigger enclosure to allow the current trigger to move when pulled.
Still not got round to doing anything with it though so I may "move it on" in time.

On the subject of "laquered finish", CS do put a sealing/laquer coating on their stocks but I'm not certain exactly what it is although I've seen them do it.

"B'rider"