I see why 4" duct is so popular. Right or wring, it is available. There are many fittings and hoods available in 4". I'm not seeing as much available in 5" or 6" which implies, I'm going to be making my own. Not a worry if I can find parts to do it. Therein lies the rub. If I go with 5", which means metal. How do you make blast gates and dust hoods? I see some ideas for 5" dust hoods, but they all appear to have sheetmetal edges (ie., non-blunt or possible sharp edges compared to PVC or ABS). I have not found any plans for DIY 5" blast gates. What has been done for DIY 5" blast gates?