Gear box correction completed, Also using an 8878 Battery used to power a large PF Motor. A mechanical switch mechanism is used to allow the battery to be turned on and off without removing the batter. Propellers (65422 x 6) and angled panels (68196 & 67142) can be purchased separately but only in Lime Green. I had to paint these satin black. Otherwise the rest of the parts I already had even though they are not the same as the original set 42113 but I think my creation came out ok. Your Thoughts, Rgds Johnno