I think I said in another thread ("And then I saw her Fascia" IIRC) that I'm OK with functional design but not much good at arty type stuff, so any suggestions for alternatives would be gratefully received. I guess the blobbiness you refer to is due to the large-ish radiuses I've used to make it friendly to machine. Obviously the smaller the diameter of the cutter the longer it takes to machine the part and as the cycle time and ease of machining was uppermost in my mind, this has probably compromised the design somewhat. As I said before, I need to do some more measuring 'n' stuff to see how far I can take the window design but still make it functional & easy to machine. I'm not finished yet .