Buck wrote: ny insight on minimum radius and clearances? Any recommendations the most affordable TT scale manufacturer?
The minimum radius all TT equipment can negotiate is 12".
Clearances should be equal to NMRA HOn3.
The only stuff imported AFAIK is Tillig of Germany. There's a forum for TT where you can get information
He models in HOn42,although not NZR the issues are similar. What suits TT does not always suit this scale/gauge combination. There are some issues with bogie stock that use Kadee couplers and the minimum radius possible.
There a few trying NZR in HO. Some of them post on the Yahoo group and I am sure you will find them helpful. https://groups.yahoo.com/neo/groups/nz_railchat/info
NZR is mainly done in S scale so you will need to be prepared to do a lot yourself in HO.