Are you sure it's not one of these Beyer Goods, see post 153? http://www.rmweb.co.uk/community/index.php?/topic/20801-nu-cast-kits/page-7
They did not have the same wheelbase as the Dean, in fact it's a lot longer and causes some issues with curves. I have a 7mm version (Mega/Gateneal) and it's really only the boiler and tender that is the same.