Padraig,
Hope you've been well since the summer. Those pictures look fascinating.
Remembering the old 12th green, and looking at your picture from behind the hole, has the unpinnable slope has been mitigated through putting all the slope is one spot, creating a two tiered green?
Interestingly enough, the bunker style reminds me a little of the bunkers we did this fall and winter at St. David's in Philadelphia, on some similar terrain. Not quite as bold, though. I especially like the one on the right hand side of #16, gouged in like that. Hopefully, the club has enough time (patience) and funds to get the rest of the course looking like that.
All the best and congrats.