I filed off about 1/4" of material on all edges and seams, rebuilt all corners using the best, strongest most time consuming and costly methods I knew that would stand up to any punishment. After trying several other suggested ways to do this, like bondo and other plastic types of fillers, I found that they were easily broken off by just grabbing it and tearing it off. There was minimal bondage and no strength at all. the material sagged and drooped and never seemed to really harden, especially for the purpose it was needed to be used for. I came up with the idea of using super glue and baking soda built up in layers as a much better solution to the problem. I was able to rebuild all seams and corners back to better than new, making it a sinch to paint over and made all edges super tough. I even had an incident where another small speaker fell and struck the edge and all that it did was crack the paint. the paint stayed in place and the edge had no damage at all. the other speaker hit it hard right on its corner. This may not be the quickest or cheapest way to do this but when you're spending as much time and money to do this it pays off to do it right. I estimated my time to be about 400 hours and cost to be outrageous due to so many set backs when using the original cabinets. could have remade new cabinets and been done in a week but wouldn't be real Heresy 2 speakers then.