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Since he is your "friend" and he is running a "business" why not just ask him what he is willing to pay for the work?
You have made parts before and should have a rough idea of what it will cost you to produce parts for him.
If he wants to give you $100 bucks he is not your friend!
P.S. last job I did for my friend when he asked how much he owed me for the simple job I gave it to him.
It's all based on what you want, template is great if your running a business and deal with quotes all day long.