This isn't the right thread (nor was the other thread with the same post). There are many threads in the
Modding Tutorials & Reference subforum regarding importing 3D Unit models (at the moment, this includes the top 4 threads). Since you're not trying to reuse Civ5 animations, the
Getting Civ 4 Units into Civ 5 - Full Conversion is probably your best place to start (even if your units aren't from Civ4 specifically).
The Blender scripts associated with
Nexus Buddy 2 import and export only work with Blender 2.49, unfortunately. You can do most of your work in 2.7 (or any other 3D modelling software), but unfortunately you need to also have a copy of Blender 2.49 for some of the import/export steps.
I'd suggest reposting in the thread I mentioned above, and including some more specifics and attach your files because otherwise it's guesswork.