I design almost all the pieces I make and feel that the proportions, joinery and asthetics must be worked out in drawing propr to building....the more difficult the project the more important the drawings. For chairs I build from full scale drawings...cut out the drawings...paste on plywood and make master templates to transfer to the stock....it is a part of the process....You will find that many of the fine woodworkers started as artists....such as Maloof, Nakashima and Jere Osgood architects....so drawings and plans allow to flush out issues that make for more refined work....IMHO