Is it possible to make slight modifications to the Hoffee case? I have an Apitius F5 (love it!) which fits extremely snugly in my Hoffee thinsulate case. I'd love to be able to add a tone guard and/or an arm rest, but there's no way I could fit them in the case without causing damage to my mando. Any recommendations on where I could go to get the case "shaved down" just a bit?