Copies of your first briefs are accessible below
First Brief - letter format
First Brief - larger format
Codex Leicester, also named Codex Hammer, is the best know among them since it is exhaustive. Bill Gates bought it recently for $50M. A full size copy is located in the Oversize books section of the Special collections in Norlim. It has the following call number
https://libraries.colorado.edu/record=b1835927~S3
To access Leonardo's drawings in his manuscripts in the Library of Spain;
Google Search: Codex Madrid, Cornell Library
This should bring up a website "Codex Madrid-ecommons@cornell university"
Click on this website and lists of folios of Leonardo's drawings will appear;
Note: page numbers are folio numbers front and back: "Recto" and "Verso"
The drawing, preferably, should be done in your own hand, even if it copies what da Vinci has made.
The text should be brief, about 100-200 words, written crisply, without repetitions, and speaking directly to the reader. Each word and every sentence should be meaningful.