I have a question for the pros out there. A buddy and i were discussing the topic of upgrading panels and this what brought up. My buddy has been an electrician for i would say at least twenty years and he said when upgrading a recessed panel it is okay to put the new surface mounted panel over the old panel, using it as a splice box. This means he would have to grind down the lip of the old panel to accomplish this task...for some reason this doesnt sound correct to me at all. Has anyone used this technique and is it legal.