Craig,
Grants are eligable to owners of the vehicle directly, either through the gov, centrelink or medibank it's just that most gas fitters have over inflated their prices accordindly and as such, claim the grant themselves as part of their payment plans. You do need to provide reciepts of purchase for the items used in the conversion and certification dates to prove it was within the given dates.
I'm pretty sure you are able to install and fit your own lpg system,(I will be check tomorrow) provided it is within the guidelines and is inspected and signed for by an authorised inspector. At worst, I could run all the lines, convertor and tank and have them connect the ends

, much the same as when rewiring your house/garage and getting the sparky in to 'finish it off'
I have read on a few forums where people have carried out the conversion using second hand parts for a profit, (falcoons and conformodores), I was just wondering if anyone here had any first hand experience, escort or otherwise.
James, falcon style mixer would be very, very easy, otherwise I have an old gas research throttle body that I could adapt to the sierra intake. It was originally on a vk inlet in an EH.
Shaun