i modified mine by throwing it out....
they are a good concept, but in reality a proper bedding job where the action is fully supported is much better. ther eis plenty of articals about people fine tuning by torquing the front/rear action screws differently. Sorry but any thing thats tuned by introducing different stress just doesn't fly with me. if your action screws come loose in the field and all you've got is an Allen key all that hard work of tuning goes out the window until you get home and re torque those screws with a torque wrench back to where they were. then add in extreme temp changes from winter to summer, and i can only assume thats going to change the POI all over again..
as far as cheek rests, maybe something like the TAC PRO , jerry from mystic precision sells them
not to sure what you would do as a bondo addition though?