Well here's my results:
If I import the NSBMD by using MKDS's new obj-->nsbmd converter, and then edit the texture and palette names to be correct, then I can successfully view my edited map in SDSME:
But there's multiple problems:
1) The map is too small in comparison to other maps (this is as large as MKDS will let me enlarge it)
2) The game freezes when I'm still in Twinleaf Town, and if I reach halfway through the town, then the game freezes, and a stretched out grass texture appears all over the screen.
3) MKDS's obj to NSBMD converter doesn't let me enlarge the map to the correct size, the maximum it will allow me to do is x1000.0000, which makes it slightly smaller than all the other maps when viewed through SDSME.
4) If I enlarge the map to x64 like the 5th Gen Map tutorial thread says to do so, then the map is waaaay too small, and has weird stretched out polygons (and the game still freezes)
If I try "the classic way", which is converting the obj to imd, and then to nsbmd (rather than directly to nsbmd, which is possible now), then I can get the correct size! But then the textures appear really dark, and not only that, but when I view the nsbmd with Tinke, it says nsbmd doesn't even have textures within it (wtf!?!?)
Either way, I still end up with a game freeze.
EDIT: To clarify, I use Maya 7.0 to convert OBJ files to IMD. Every 4th/5th Gen Mapping tutorial I've found says you can use either 3DS Max 6 or Maya 7. (though it appears that everyone that has had success used 3DS Max 6 -_-)