Not all are listed under the "Custom Made" name, as there were also 2-wheeled factory made models, for example:
http://www.imcdb.org/vehicles_make-Goldoni_model-Special.html
http://www.imcdb.org/vehicles_make-Goldoni_model-Super.html
http://www.imcdb.org/vehicles_make-Ursus_model-C-308.html

I think there was at least one more type, common on the site, but forget of what brand it was and from which country - can't find it now.