There is 1 big road block when designing a custom dashboard and that is screen real-estate. There is only so much room you have to work with and your goal is to fit use full information on the screen. I find that the cluster level is the best trade off for both the amount of information and the usefulness of that information. This gives a good “at a glance” idea on how your environments is running. Going any higher specially if you have multiple clusters sitting under a datacenter or vCenter then the numbers get less of a meaning.
There is no right or wrong way to display a custom dashboard and this is basically a guide of one that a client of mine is very happy with, all widgets are on a 5 minute refresh and it automatically cycles through all the clusters while logged in on a screen for there teams.
Update 26/03/2014 – How to for this dashboard has been posted HERE

Very Awesome, Thank you
Hi,
What a wonderful Dashboard! Any plans on making a step by step on how to make it?
Hi Danny,
Thanks for the comment and glad you like it.
Great idea, something i was thinking of doing at some point. I will start putting one together today. may have to be multi part as there is quiet a few super metrics involved in some of the information.
Stay tuned ill get one up
Cheers
[…] have had a couple of requests to do a how to guide on setting up the dashboard I showed in THIS post. So here it […]
Quick how too has been setup HERE let me know if it helps
cheers