I've been thinking about how big this could realistically go...

I've been thinking about how big this could realistically go since the explosion in the price. Obviously PET isn't about to become a BHP or CBA but there's no reason it couldn't develop an international presence along the lines of a company like Worley Parsons. They're currently about 13x larger than PET by market capitalisation, and Newing is suggesting the current contract (driving the explosion in share price) covers about an eighth of one province in one country. The future looks very bright.