[Bathrone]

Tenrocca, my advise is dont trust the certified engineering signatory and rsearch all the requirements anyway. Many freinds and my own personal experience is that they just wont put the time in to think your project through and its better to manage them than have it the other way around.

Your engineer and yourself need to work with the NSW RTA. Most typically when you get your chassis date signed off by the RTA theyll do a two year period, but a bloke I know had his extended another two years after he requested an extension.

Worst comes to worst, the chassis can always be modified anyway if the engine choice changes.

The RTA have a list of authorised engineering signatories for NSW. Keep in mind though that some certificates arent worth the paper they are written on (eg. my mazda has a motor too large according to the rules but I still got a certificate) and at the end of the day its the owners responsibility to drive a roadworthy vehicle. An engineer cant override the rta.