Possibly; I'll check with herself tonight...
Is it coggable 
I reckon so. Most of the route is Bryan Chapman 2004 type of roads. The bit around St Davids has a few steep climbs, but they're not very long and I've ridden them all (the A road ones that is) in the opposite direction on my 53/17. Probably need to walk a bit after Tregaron and maybe some of the Elan Valley, not sure what goes on there.
The A483 from Aberystwyth to St Davids is probably best done in the small hours. It gets a bit busy on that road.
I'm not sure that I can do the 17th July onwards, but I'll see how much oliday have from work and about a few other odds and sods. It looks very tempting as a fun 4 day warm up for the Mersey 24.
Otherwise, how about a 3 day ride over the August Bank Holiday?
I was going to go to Mildenhall Rally, but this looks like more fun.
It'll be quite a tough ride. tougher than the New Forest and El Supremo's 1000, but not as tough as Shawn Shaws' Crackpot.
The New Forest wasn't all that tough, you just couldn't go fast enough to get much time in hand. Most of the slower riders who wouldn't normally gain much time anyway never seemed to think that much of it. It was just a bit harder than usual for the faster riders.