I understand what thetrueman wants to do, May becasue I wrote the wizpic decoder
Basicily he wants to rasie part of the front panel where there is a tactile switch underneath the front panel he has made so that he has a clear press rather than the front the front panel been flush on the case , becasue this can casue fasle switching which depends on how close the switches are together.
Sorry I can't really help I know what you mean because I had the same problem once, I did try to heat and moulde the panel but this made a mess,
This may be a simple idea not tried it myself use a small thin say M3,M4 or may be M5 washer glued over the hole to rasie the front panel. Both posts above also give some good ideas