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Oh yeah if you’ve got equipment to cut wood accurately they’re dead easy - I bought the ones in my studio but I’ve seen plans/calcs around for the ‘right’ insulation. Mine are on brackets that stand them off the ceiling, as the air gap increases effectiveness.
I was going to mention restaurants with no treatment - nothing worse than the sound of chairs and cutlery scraping with people getting louder and louder!
I could probably do a ceiling cloud without great difficulty. Knock up a frame, fill with rock wool, wrap in cloth and hang from ceiling. Would need to locate the ceiling batons.
I may also put one into the dining room as I hate it when noise reverberates and people end up shouting over each other.