Basically that is a matter of personal preference.
Some modellers are more finiky about everything being to exact scale then others, especially fiddly little details.
Generally that is because most such details on the earlier models tended to be on the heavy side, simply because they were easier to mold and were not so easy to bend or break, like some of the spindly landing gear struts you get these days in soft plastic, that can tend to go "bowlegged" on you.
As for making a and installing a new pitot tube, just like for decal markings, I go to the internet and seek to get photos and any scale drawings that might be available for that detail.
I then take a soft lead pencil and mark the position that looks right on the wing's leading edge.
I then take my tiny drill set, and find one that looks about right (a little on the small side is better then too big) and drill a hole in the wing's leading edge. If need be, I first notch the spot with a triangular jeweler's file to make a flat spot for the drill's point.
Then I go to my junk box, which is full of intresting sprue's and spare parts from other kits, and find something that looks close, and modify it accordingly, whether by stratching, or sanding, or filing, etc.
Then after I install it, if it doesn't look right, I pull it out before the glue hardens, start over and make another one until I get the look I want.
OK?
Tom
Tom T
“Failure is the opportunity to begin again more intelligently.”-Henry Ford
"Except in the fundamentals, think and let think"- J. Wesley
"I am impatient with stupidity, my people have learned to live without it"-Klaatu: "The Day the Earth Stood Still"
"All my men believe in God, they are ordered to"-Adolph Hitler