Im not sure what is your problem?
Sure learning the API takes time ( it can be worse: try to look at 3dsmax SDK which is really low level, with parts missing or unexposed...)
Basically your answer would be append components:
rip from your mesh array :
- points /
- face index /
- normals / or uv /
append them into one bigger array ( just be sure to add on the index array an offset / stride )
and later create with MFNMesh.create
Something pretty trivial to do, you just need more experience?