Speaking from Experience of designing a lot of aircraft it's acutally easier for someone with an untrained eye (and mind) to scribble a workable design on paper.


The reason being is that looking at a screen is COMPLETELY different to looking at an aircraft, full size on your drafting table.

You will instantly get a feel for what you're designing if you grab a pencil. Lots of printouts are required before you reach the same thing on CAD.