Todays post is a lesson in the importance of research!
Previously, based on the evidence in front of me, I commented that the Dia.64s were built with through pipes only and that vacuum cylinders weren't fitted until approximately 1910. Coates states in his book that the original drawing, No.5741, has not survived, before making the above suggestions. However, upon asking around on L&Y groups on a popular social media site, if anyone might know anything about the general arrangement of L&Y wagons brakes (thinking I was now modelling an unfitted morton set up), someone kindly shared a copy of "lost" drawing No.5741, dated 05/04/1905 and signed by Mr Hughes. The "lost" drawing clearly shows a vacuum cylinder and arrangement pretty much in keeping with the later style.
So, with that, it appears I'm back to building the kit as intended with the vacuum cylinder in place!
- James