Thanks for all the kind words gents, great to see such positive feedback so far. As Richie said there's a few things to add/correct before we have it bang on.
Richie also deserves special praise in particular as if it wasn't for his tireless work on both these and the ballast wagons between research and scrutiny and corrections of the various CAD drawings to get them as good as they look in the drawings they wouldn't be anywhere near this high standard. Not bad for a new father with a day job as well!