Yes, Grafana is highly customizable and all of the graphs are editable. You can even build your own charts from scratch, though I have it locked down so that you need the admin password in order to permanently store them. If you compose a chart on statoshi.info that you think would be useful for the general public, feel free to save it as a JSON payload and send it to me; I'll add it as a permanent chart.

As for machine specs, I'm running on a single core VPS with 30 GB of disk (that I'll need to bump up soon) with 4 GB of RAM, though bitcoind only uses about 1.5 GB. My node uses ~150 GB of (mostly upstream) bandwidth per month. I hope to eventually make it easier for people to install the entire software stack required to run a Statoshi instance; at the moment it requires a fair amount of Linux admin skills to install & configure.