Yes Mike, Rupert is keen on many more playing Options. He's even considering a 5700 yard quirky masterpiece.
Having never been to Ballyneal, but having a login on GCA.com, I offer the following advice to Rupert. I fear that 18 is too expensive for this type of experiment.
I would build a clearly junior 9 such as they have at World Woods, Maidstone and Sleepy Hollow. If by chance it is a busy morning, you warm up on the junior 9, tired at the end of the day - you go to the junior 9. Play it with irons only, mad scrambles where everyone is trying to hit every green with driver, could be a blast.
If I was looking at courses to model holes/themes, I would go to my two favorite 6000 yard courses, Merion West and Cape Arundle. Study and then build Walter Travis style greens. You need an architect who understands old, will not charge too much and is a change of pace from Tom Doak. He will basically live in a sleeping bag. My choice would be Ian Andrew, who I have never met. He just seems like he would be the perfect fit.