There is usually one or two of them that show up to Airventure or Sun-N-Fun each year.
Back when I was at ERAU I designed a Spartan Executive inspired modern aircraft on Catia powered by a M-14P Radial Engine:
Hallmark has a nice Christmas Tree Ornament that can also be a good desk model of the Spartan Executive:
Wings of Texaco has a larger model of the aircraft:
Current RC options are limited, outerzone has 1 plan and its actually from 1938 about half way through the production run of the actual aircraft.
& the Laser cut kit: https://lcka.com.au/product/spartan-7w-executive-15-laser-parts-kit-jb/
With global shipping challenges this may be a difficult product to get into the states however for readers down under it’s a good option.
Of course with modern CAD systems, a ton of images of the aircraft it would be an easy job for a modern 3D printer to make a very detailed RC version. The Anycubic Chiron is an excellent large format 3D printer for PLA, LW-PLA, ABS and other filaments. I did a write up of this printer almost a year ago: https://gouldaero.com/2021/01/06/anycubic-chiron-3d-printer-product-of-the-month/