I think FASA also felt there was a lack of non-human Federation ship designs in Trek as well back in the day. Their RPG ship recognition manuals included a handful of Starfleet ships that were supposedly designed, built and fielded by Andorians. The Andor
come to mind. And yes, I got the impression that the Vulcans also seemed to have a small hand in some Starfleet designs as well. The Ringship Enterprise (Declaration Class)
seemed to derive its pedigree from Vulcan influence in particular, with the toroid warp drive.