"Lake Alexandria" is a big place and no-one has yet nailed down the location of the ruin. It's visible on google earth and street view. The bitumen road fronting the ruin is a popular tourist route. :)
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Mulgundawa
I'm thinking it's around Langhorne Creek, but I haven't been able to find it on Google Earth.
Tolderol
Ok, its actually on Lake Rd, just near the Richmore Rd turn off. Didn't see it on the comp last night, but just spotted it in the phone now.
Give to Jon, he's been in the right area first before me. :D
It's an interesting looking area that I'd like to explore, and follow up with going across to Deep Cr etc, as well as going over to the Innes NP.