Today we have a very interesting model sheet, the Dodo Suggestions model sheet (550-8007). What I like about the various 'suggestions' model sheets is their rough nature, a lot of the construction of the characters is still visible whereas a 'final' model sheet is generally taken directly from cleanup animation drawings.
posted previously a series of stills that included Tenniel illustrations of the Gryphon and Mock Turtle, so the inclusion here is not without precedent, but still unusual.
Also, a word about model sheet numbers. The code number dates the model sheet. This sheet has code 550-8007, the 550 represents May of 1950. The 8007 is some other internal numbering scheme, probably having to do with when the sheet was registered with the production staff, but that is unclear to me.