I have never used drawing software to do knife design. Maybe I should try it. But I do like to use pencil and paper. I can spend more than an hour in a day just drawing profiles. I have used French curves a lot in the past, but now I can draw pretty much the profile I want free-handed. I would say about 1 out of 100 drawings become a wooden mock-up / model, and about one out of three models become a knife. I have got big manila envelopes stuffed with drawings. Does anybody else do this? I guess a lot of it is to distract myself from everyday worries.