I'm working on a tool to help me bring together my accounting, sales, bank and payroll systems into one dashboard so I can see a single snapshot of my businesses. Has anyone else built something like this and if so what was the good, bad and ugly of it?

I know Quickbooks kind of does this in some capacity, but I'm also looking at bringing in some facebook/google ads detail as well as my inventory system so this would be a bit more comprehensive.

If you have done this, I'd love to get your feedback - if this interests you too, reply to this and I'll keep you posted on what I end up getting built.