How about a Ryan Navion. Not overdone, designed by North American Aviation, retractable trike gear. Old Berkeley plans may be available. Here's a link to Cleveland plans in various scales, you did say "scratch" didn't you. The sliding canopy may require vacuum molding.
(Enter North American Aviation, Light Civilian, and Post WWII)
wiki description: http://en.wikipedia.org/wiki/Ryan_Navion