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Really - don't do it. No offense intended here. This isn't the hard way - it's the stupid way. You're wasting your time on something that would be better served on other things. This is a huge...

It's a LOT of work and you will find a lot of inconsistencies in each room. What works for one room won't work for another etc. Some you can scrape the data feeds, others you need to rely on them...