I think this workshop is a great idea and will help alot of people. I've already learnt a few things
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Anyway here's what i've made so far...
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I made the holes by pushing some edges out of the way. Then i removed the edges where i want the hole to be. What was left was a big 16 sided poly. I inset that polygon and made it a circle shape then bridged it to the other side. Constrain to edges really helped with this.
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Hopefully this has helped someone.
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