Actually, it's not exactly "Pre-" WW2.. The Fairchild PT-19 Cornell started mass-production in 1941. The "PT" mean "Primary Trainer", meaning that was the aircraft used for Primary Flight Training, which was followed by BTs or Basic Trainers, like the Vultee BT-13, which introduced the Cadet to more powerful engines, cross-country flights, Instrument flying, and radios, and finally, the ATs, or Advanced Trainers, like the AT-6 Texan, which taught the cadet to fly formations, gunnery, and more and longer cross-country flights. CMK makes a 1/48 scale resin kit of the Cornell.
http://kits.kitreview.com/plt142reviewrk_1.htm
I'm kinda partial to the PT-19 as it was my first "Real Warbird" check-ride back in 1996. Back then, my goal was to fly, at least once, in every type of USAAF/USAF aircraft on my Dad's USAAF Form 5... Alas, it ultimately was not meant to be because I ran outta money...(And also because several are types that have no airworthy, two-seat examples of in existance in the US, but I got a few of 'em, lol)...
Another of the "Pilot Makers", the Stearman PT-17 Kaydet, First flown in 1934, and throughout the entire Second World War.
The US Army Air Corps PT-17 Kaydet (which WAS pre-war designed and manufactured aircraft, although it stayed in production until the almost the end of the war, and thousands were sold as surplus, most being converted to crop-dusting variants) had three different designations based on its power plant: PT-13 Series, PT-17 series,and PT-18 Series. There were also 300 Lend-Lease Canadian versions (PT-27s)...
The US Navy version was the N2S, AKA, the "Yellow Peril"..
Lindberg makes a pretty good 1/48 scale kit of the PT-17A.. I say "pretty good" since it's the only 1/48th injection-molded kit in that scale that I'm aware of, and is a 1960's-era kit.. Plus, I like those old kits... It runs about 12.00 and is currently in production... I've got two on the bench, one each PT-17 and N2S.. Another member here, Fermis, built a copy of it and "took the Gold" at a contest with that kit as well..