You need to get a copy of Modern School Shop Planning from Prakken Publications. I'm not sure when the last edition came out, maybe early 80's. It will have all the info you need and more if I remember correctly. Your state department of ed should have one or more consultants who work with technology ed, industrial arts or voc ed that should be able to help. I'll see if I can find my copy, I may "loaned it out" and not seen it since.
If you get more students than space allows it helps to have an authority of sorts to back up your opinion with fact. Then you should write the principal, superintendent of schools and school board (individually) pointing out that you feel that the class is overenrolled and the number of students presents a documented safety hazard. Point out that you have gone on record with notification and believe that they will clearly be negligent in case of an accident resulting in serious injury.
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Ron
"Individual commitment to a group effort--that is what makes a team work, a company work, a society work, a civilization work."
Vince Lombardi