There are several sources for 3-views of aircraft, one of them is from Koku-fan from Japan, they probably have the best 3-views available with good line quality and have good outlines that match the photographs of the real airlplanes. I will use a Koku-Fan 3-views over any other 3-view when building a model. Another good source is the Paul Matt 3-views, his drawings were based on actual measurements of real aircraft, his two books are worth gettng. Before buildng a model from a 3-view make sure the 3-view is correct, look at photographs of the real aircraft and ask yourself is this 3-view correct?
As an example there is a 3-view from the 1949 time time frame for the B-29 and the vertical tail is completely wrong, does not even match the photographs of the real aircraft. Remember you can not draw your own 3-view for scale competition, and you must pick a 3-view that best represents the version of your aircraft.
Always get a 3-view that matches your version of the model, if you are building a P-51D, don't show a 3-view of a P-51A or P-51H, they have different outlines.
Get hold of Bob Banka at and ask him if there are any Koku-Fan 3-views for the aircraft you are interested in. Once you see a Koku-Fan 3-view you will understand.
http://www.bobsairdoc.com/I cut my own foam wings with a very bow that I made myself.