I've finally finished this one;
I didn't use the supplied chain as it didn't fit through the pulleys well enough for my liking (probably my fault fitting them together) so I substituted it for a 110mm length of 27 link per inch North Yard brass chain, suitably blackened. In hindsight 110mm is perhaps a little too long. I attached a single coupling link on each end, from some scale 3-links, which has been glued to the chain hooks on each end. The chain actually looks slightly underscale but I can live with that. Couplings themselves are Smiths, standard on my EM wagon stock.
The numbering (deliberately crude) was done with a Pergamano mapping pen and white Windsor & Newton ink, thanks to Paul (Worsdell forever) for that tip.
I did toy with the idea of making it work but decided againt it. Next time perhaps...
A nice little kit, one day I'll make a couple more.