Milton,....I have a couple of questions: How does one...such as you,....take the given actual dimensions of the real aircraft and then translate/draft them down to exact scale the aircraft you're designing?
Brad, see attachment for an example 3-view drawing with dimensions.
Tom has it right. We model to real world dimensions.
Once you have proper 3-views (unlike the attached), you set the views up all scaled to the same L,W,H per inch/meter/pixel.
Then in the design program, (I use gmax) you setup a calibration box the exact dimensions of the aircraft (L,W,H). Once done, you apply mapping and place the 3-views on the sides of the calibration box. Once done, you have 3-views of the aircraft in real world dimensions.
-What program do you use to 'downscale' without loosing the actual dimensions? N/A
-Is there a bit of 'trial and error' when reconstructing? N/A
-When do you know the aircraft you're designing is 'spot on' in scale proportion and realism? The model is built to match the 3-views that are to real world dimensions. Spot on is too precise unless you have dimensions of every part on the aircraft; no one goes to that extent to my knowledge. 99% of the parts are built to the 3-views, or are "proportioned" in the VC by sight and verified in all angles against other things with regard to positioning, size, shape (somewhat of an an art). Unless you have the real aircraft at your fingertips, you do not have a lot of options available to you.
-Are there times where you have to fudge certain parts of the fuselage (let's say) since there's no given dimension information given? In other words,...sometimes you might have to use the 'eyeball' method in order to get the aircraft correct. Yes, as described previously.