I think that'd be a hard sell...there is so much free information on the net and especially in the DIY section here...I mean, if these plans were VERY VERY easy to follow, well written, fully explained everything and yielded fantastic results, than maybe...
I could do that. I know the guy who builds Jeff Gordon, Jimmie Johnson, Terry Labonte, and Kyle Bucsh's engines. I could sell the wheel mechanisms after I have them custom made. Then, sell them. Dont know how Neil Rowe would feel, though mine would be a lot cheaper.