Thanks for all that......
Since I am using brass barrels for the guns, the holes were rather unstable. So I have plugged them with PVC rod, then flattend the ends and then drilled them to receive the barrel, and the pitot tube, THEN I finished the plug to the curve of the edge of the wing. Would have been a nightmare to drill on the curve. Stuck in a block behind the cowl as well, did the same for the barrels.
Gonna start painting pretty soon, I hope!!!!!!!!!!