In 2021, before I discovered this site, I finished Artesania Latina's King of the Mississippi kit from the 1980's. I believe they still make it. Occre has a similar kit. I will be starting a build log in the next couple of months, on Model Shipway's USRC (United States Revenue Cutter) Harriet Lane (they call it USCG [Coast Guard] but the Coast Guard was not formed until 1915, long after the Lane's sailing days were over). This kit is a sidewheeler with sails (the kit has the sail plans but you have to purchase the sail cloth separately). Good luck with you searching!
What ho, shipmates!
HenryC, this is to you most specifically and to Neilm more genrally.
The interest in paddle-wheelers is lovely to see! I have little to add to the discussion of the riverboat. Like the usual consumer, I want to build warships

. In either case, there are a small number of paddlewheel kits relative to all sail kits. So, as many shipmates have already advised, you'll likely have to scratch build if you are looking for something specific. And even if you buy a kit, as you already know, you'll be effectively scratch-building.
As far as sidewheelers go, there are several options. I finished my version of
Harriett Lane in May 2025. As HenryC pointed out, it is misnamed on the kit box. It build into a handsom model (IMHO), but took a lot of research and reworking and simply deciding to ignore the dire warnings about adding detail which pepper the instructions. My log on
Harriet Lane is
https://shipsofscale.com/sosforums/...ipways-1-96-scale-circa-1863-completed.13052/
I am in the process of building Mamoli's
L'Orenoque, having been bitten by the sidewheeler bug! The kit does not represent the real
L'Orenoque, a French sidewheeler frigate. Check my log for the details.
https://shipsofscale.com/sosforums/threads/lorenoque-mamoli-1-100-scale.16617/
Krick's offereing
Gulnara looks like an great kit - 1:50 scale 1837 sidewheeler.
Woody Joe has a 1:120 scale version of
USS Susquehannah.
Of course, plan sets are available for
USS Susquehannah and
L'Aigle - Napoleon III's very elegant ship of state. As to
L'Aigle, it is much more a display of elegance than a warship. She carried popguns for saluting.
Hopefully, I have not overshared. I have a problem with that.
Blessings. Peace. Gratitude.
Chuck