[Chris is me]

Teaching people how to use CAD tools decently takes a couple of lessons over a few weeks. Teaching people best practices takes longer. Teaching people how to actually do detailed design for FRC takes far longer, and really requires several years' experience to get okay at it.

Honestly, doing full CAD of a robot isn't something a few students are going to be able to do with 2 or 3 weeks experience in a class. For a lot of teams that have some mentor involvement, a good approach can be to gradually transition over a few years to a student detail designed robot rather than teaching and letting them go for it cold. The first year, have the students do design work high level through prototyping and sketching concepts, but have mentors do the gritty detailed work of actually drawing and assembling the parts. Second year, as you get more of a chance to teach the students, have them start making brackets, plates, smaller assemblies, etc. while reserving mission critical designs like gearboxes and system integration to the mentors. Third year you can really get close to a full transition with mentors playing more of a design management role. The key here is that even when mentors do CAD work, students need to be involved - at the very least do some modeling on a projector so students can see and comment.

Obviously said approach does not work for every situation and every team, and some don't like that level of mentor involvement, but I don't think you can really go from zero to full robot CAD in students in just 1 season. I'd love to be proven wrong - please tell me what you do if you accomplish this so I can learn how to better inspire students.

Also, watch 973 RAMP. Everything they've ever released. The ratio of valuable information taught to time invested in watching the videos is through the roof. I think 973 RAMP had possibly the biggest impact of any one thing on the design / CAD habits of my old team.