The Fly Baby is a very popular Home Built aircraft with a good amount of RC options as well.

It first flew in 1962 and was designed by Boeing historian Peter M Bowers.

The Fly Baby can also be converted into a Biplane called the Bi-Baby.

http://www.bowersflybaby.com/ is a great unofficial Fly Baby web site

https://eaa.org/eaa/aircraft-building/kits-and-plans/d—g/fly-baby

Is a great resource, If you are an EAA member there are Sport Aviation articles ranging from 1962 – 2005 plus a pdf download of the 74 paged Building the wood airplane part of EAA’s “HOW-TO” series from way back.

 

Now for some RC options, Outerzone has a bunch, here are some that look quite workable today with electric power.

56″ Span from Modellismo in 2012

https://outerzone.co.uk/plan_details.asp?ID=4062

 

72″ span from RCM in 1980

https://outerzone.co.uk/plan_details.asp?ID=5837

And for some kits & Arf’s

Sig 68″ Span = https://sigmfg.com/products/seagull-models-bowers-flybaby

Balsa USA Giant 112″ span = https://shop.balsausa.com/product_p/447.htm

Balsa USA Giant 88″ span biplane version = https://shop.balsausa.com/product_p/452.htm