Earlier, Ron Wanttaja wrote:

...I am reminded of an article I read several years ago, about
the development of the Aviat Husky. While looking much like an older
design, it was a brand-new aircraft that was certified under the modern
Part 23. The article quoted the company president saying that the
certification process was not especially onerous or time/money consuming.

Probably Alfred Scott's article "Lite Engineering and the Myth of
Simplified Certification":

http://www.seqair.com/Other/LiteEng/LiteEng.html

Thanks, and best regards to all

Bob K.
http://www.hpaircraft.com/hp-24