How can you say 'Let's begin' without having any design solution to proceed further? 😨 1:51 No! Why? Your logic is upside down. A. If you can attach small fins close to heatsink, you can expand the area of fins. B. You are sacrificing/backtracking previous works only because of 'distributed holed in large fins'. 3:21 I expected this.... 6:16 To be reasonable this test should have done before any design 'decision' and, of course before 'ASSEMBLY'.