Having worked as a Tech Counselor for two years in the 1/2 day and one 2 day weekend workshop, and given forums at Sun 'n Fun and Golden State Airshow(s) (caveat, more than 3 yrs ago) I will echo the benefit, but qualify it slightly by opining that while you can get great exposure to Aircraft Sheet Metal processes, there simply is not enough time for you to learn how to "build".
Case in point, at the 2 day weekend workshop, the Sunday activity was building a scaled wing/aileron assembly. All students were talented and experienced with hand tools. The fastest completed in 2.75 hrs. During a brief, informal, post-mortem, I asked the other Tech Counselor, in front of 8-10 participating, how long it would take him to complete the project. I held up my hand to stop his reply and whispered in the closest student's ear "30 minutes" he gasped in surprise, only to be joined by the rest (one or two came off their stools) when he said: "About 30 minutes".
Couldn't ditch the opportunity, I grabbed an extra materials kit and, in about 2-3 minutes showed some techniques that convinced them as to speed and impressed them in the ability to significantly improve the quality of the result.
I got my initial exposure from guys that learned the discipline in the WW-2 aircraft factories. There's lots of experienced guys out there, you'd be well advised to seek their counsel. It will save you time, money and enable a superior result.
Onward and upward
mjb