I contacted the company and was impressed with the response for...

I contacted the company and was impressed with the response for both timeliness and contextual information. Paraphrased.

The 12-18mth indicative timeline would follow a flow test + agreed offtake terms, facility design, signed agreement, etc. This was expected by the end of the year.
Cost of infrastructure would depend on design, which in turn depends on flow results, offtake discussions, so more clarity will come after those results are known - but taking a modular approach for the infrastructure.

Onto the flow test then, GLTA involved.