Spanish to English Tech/Engineering Architecture drafting (I think)

Hi All

This is a seemingly simple query but proving much more difficult than I envisioned. Here's the context:
In a novel set in the late 80s-early 90s, a Mexican woman is attending college in the US. She is studying animal husbandry. One of her courses is in "planos". For her final project in the course, she has drawn a "plano" of a meat-processing facility that includes all of the details (walls, chutes, fences, parking lots, etc) of the slaughterhouse. She is constantly practicing making "planos" the way her professor does, imitating the way he holds his pencil, etc.

I have so far been varying terms between: blueprint, technical drawing, and wondering on occasion about diagram and design. I don't think there is one term that will fit for all instances (e.g. I am fairly certain I need to use blueprint some of the time, despite no mention of special blueprint paper, and yet I have not found examples courses in "blueprints" in US colleges, and for the course I think probably "technical drawing"--or "drafting"???).

No one has used any computers in the making of any of these drawings, btw, if that makes a difference.
Is there a good informal term that means the same thing as blueprint? For instance, at one point she is furious and yelling at the teaching assistant, "I want my plano back! Give me my plano!" And "blueprint" here sounds too formal to my ear. Other options? Here is one more example:

"Other students’ technical drawings (or whatever term I end up using) were 1.5 meters by .70 meters, each rolled up and placed in a.8 meter document tube. Mine was 5 by 7 meters, rolled up and stored in a 5-meter document tube." (Her professor, btw, later tells her that her "plano" is useless because she has included so much detail, and that a "plano" should be an abstraction that contains only useful information, not every detail.

Many, many thanks in advance!

Lisa