that's the worry getting the hole in, the hole is 89mm and there isn't a lot of room for error, if it's in the wrong place it leaves a fair old hole to fill, the tube is dog legged and runs parallel inside the wing so there isn't a point where you can offer it and get the perfect markings to drill.
If there is nobody who has a template then youre right I will have to gamble and hope its right, but to be honest i have never won the lottery and luck never seems to be in my favour when I gamble something like this