general principle of autocad question

Hi, Totally new to CAD progs. Is it that when starting a drawing of an aircraft, one has to decide from the outset if its to be in 2D ortho view, front, side, plan underside etc
views as first or third angle projection, or if its to be constructed instead as 3D objects ? If as 2D , will a canopy drawn in plan view and side view be generated bu the prog in front view, rear view and as a pecked line in underside view ? If not, and the user has to do traditional projecting of lines, hitting 45 degree to cast down to the front view from the plan view etc, traditional draughting in effect, and errors creep in, would wanting to create a 3D model from this later on be full of problems ?
If on the other hand one starts out creating 3D objects that in time make up the aircraft, this would I assume generate 2D ortho plans for use in aviation books etc. for scale modellers.
The trouble is, if I have but a few WW2 plans, some site measurements with ruler and curve gauge of the item, a stack of pics, some plans of individual airframe components etc, which need a certain amount of detective work and positioning, tracing over etc, to bring this jigsaw together, would the 3D approach be feasible. I so far have drawn 2D plans from such, but seek the ability to see a prog generate items in the views I havent drawn it in. Many site dimensions are taken over the aircraft skin, sometimes following a known internal frame, sometimes diagonal following just skin !, usually the former way. Can these be plotted in autocad and how ?
Hope this makes sense as a question.
Steve
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In AutoCad at least you could do either or both in the same drawing.

No
The drawings can be done to an accuracy of 9 decimal places
would wanting to create a 3D

It should not be.

Yes you can use the 3D models to generate the 2D drawings.

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