looks like a pretty cool idea/application. i did something similar, but smaller scale for my website - click the red house, the 'tank status' section on the left is updated every ten minutes from a lighthouse controller.
i don't forward any outside ports to the lighthouse, so you wouldn't be able to get at the index/graphs/settings/cfg .htm files, but as part of what feeds the above, i do have a data.htm file being forwarded to an outside port - i'll PM you the link.
the data.htm file just has a line delimited list of all the parameters you're going to get from a lighthouse - current tank parameters, as well as the longer term historic data that feeds the graphs.htm file...so it's essentially what you'd be after, i'm guessing.
what language are you working in? if php, you're more than welcome to what i've thrown together to have as a starting point.
