Latest news on this is that the site at Thong Nang, on the way to Thong Nai Pan, has now been discounted. The trees have been cleared but the experts have now decided that the cross winds from the mountains will make flying difficult. The construction is now moving to a new site near Chalokulum.
The ATR 72-200 turbo-prop plane operated by airlines such as NOK AIR, can according to the manufacturer, take off with a maximum payload with a runway of only 1091 metres. A 1,500 metre runway would, on this basis, be perfectly sufficient to allow a small commercial passenger operation to operate.
This said the clearing in the jungle might of course be the start of the golf course, as this is something else (like the airport), which has been in the 'planning stages' for many years.