Indeed, and I would have been reluctant to post this, if it hadn't come through Irish Rail itself.
I'm sure that Belmond know what they're doing, far better than I do, but it does seem very ambitious on such a small network.
This has been announced - http://www.businesswire.com/news/home/20141105006215/en/Belmond-Launch-Luxury-Touring-Train-Ireland#.VFp5HDSsV8F - it will be interesting to see what actually happens.
Will we see Mk 3s on the network again?
Bray to Dublin is still on iPlayer for some reason - http://www.bbc.co.uk/iplayer/episode/b01bqktm/great-british-railway-journeys-series-3-21-goes-to-ireland-bray-to-dublin - for those in the remains of the Empire - or with a proxy server...
In the old days there used to be such things as Pattern Makers' Rules - these were available in various degrees of "contraction", depending upon the material being cast - they were a few % over-size, so that the casting made from a pattern constructed with them would shrink to the correct size on cooling. You could make a rule of your own to suit your contraction rate - if nobody has a more sensible solution.