The Accucraft Decauville model is a very likely candidate, but is not a common model here in UK. However, to start off, try calling Graham Langer, boss of Accucraft UK. He is VERY helpish, from a lot of personal experience. Tell him that what you REALLY want is a complete chassis less all the steam bits, however, think £££££££££££££££££££££££££££££££££££££££££££££££££££££........
The man actually behind the is Accucraft's man in Germany, Lorenz Schug of MBV Schug in Detzem.
MBV Schug
Detzem, Germany
www.accucraft.de
info@accucraft.de
Tel: +49 6507-802326
He might be able to be able to help you. If your German is rusty, he speaks very good English. You could also try Bram Hengeveld in The Netherlands -
http://exclusivemodels.nl. He also speaks very good English, although I annoy the socks of him by using Afrikaans.
If you DO get in touch with Bram, tell him I sent you.
PS - Égide Walschaert, a Belgian engineer, must be rotating in his grave to see his name mangled like that. It's like spelling Oliver Bull
ied, in stead of Bull
eid.