The first one on this CE1967 labeled foreend had one side of th draws cut 1.4mm too much so about 1/4 to 1/3rd of one draws didnt have support, I added a 1.4mm piece of rimu.

Second is the rimu cross piece

3rd is the finished rear end, I made a wee oops cutting one D piece too deep.

d piece close up, rimu

laser line lineup on my bosche chop saw to cut the back piece out to clear the trigger so its a 1/2 not a mk1