Welcome Ian not only to Sn3.5 modelling but also the SSMRS. Now, we will all await with bated breath to see some goodies. I'm not sure what the crossover might be, but there are several kitsets available from NZ, freight and passenger cars etc. Take a look at Phillips Models in NZ - not got the link to hand but he has just taken over the South Dock range and there might be something useful there.
St Albans was great fun, NZR, SAR, Malayian, Belguim, EKR and on and on - not a GER loco in sight!! (at least on our stands) Also Bill Pearse's "Bank Hall Sidings" was on show. I will be updating my blog in the next day or so http://uknzrmodeling.blogspot.com - watch this space.
Ian H