Years ago, at a Nautical Research Guild convention, I heard a lecture by John Fryant, one of the most knowlegeable steamboat modelers around, about his model of the Robt. E. Lee. He'd done a great deal of research on her.
One revelation (to me at least) was that there were really only two reasons for the fame of this particular riverboat. One was the Currier and Ives print of her race with the Natchez: http://ualrexhibits.org/steamboats/wp-content/blogs.dir/10/files/05/ualr-ph-0101_na_na_na_na_pho065_web.jpg . The other was the song "Waitin' for the Robert E. Lee" - which in fact was written about a later, smaller vessel of the same name.
I did a little digging on the web, and found this set of plans, which looks pretty impressive to me (though I'm certainly not an authority on steamboats): http://steamboats.com/museum/modelplans.html .
Here are a few photos of Mr. Fryant's model: http://steamboats.com/museum/fryant.html .
And here's a pretty good photo of the actual boat: https://farm8.staticflickr.com/7034/6808751505_5d3f47d081_z.jpg .
If you google "Robt. E. Lee steamboat" you'll be taken to a whole lot of interesting pictures - including several shots of models built, to varying standards, from the Pyro/Lifelike/Lindberg kit.
The shortage of really good American riverboat kits - plastic, wood, and other - is a real shame. They make spectacular models.
Good luck.
Youth, talent, hard work, and enthusiasm are no match for old age and treachery.