Made the Big Cut today! Decided it wasn't gonna get done just staring at it week after week. Thanks to all who have gone before for the advice, it really helped. The best advice by a number of people in my opinion? It's not that bad and to just go for it! In the end I used my Dremel tool with the plastic cut-off wheel. Practiced on the molding flanges first using 2 and 3 passes to make the cuts. However, when it came to the actual Big Cut I found that my skill had increased where I felt comfortable making the cut in one pass. As others would say, your mileage may vary. Now I hope everything lines up and fits later on...