Yes i did.

First lets say this:
You will always get a bunch of unstitched Nurbs Patches, which is fully correct and wanted.
I use all these Patches to get the Modells to Industry like molding etc.

a)
make sure you only have QUADS, NO TRIGONS WORKING, you will end up with a mess
b)
make sure you know your Polygon Count exctly
c)
Convert into Subdivision
d)
Convert Subdiv in Nurbs
e)
Export as IGES or whatnot

Another way is if you have it available use Rhino. It has several repair Options and is a NURBS based Construction Software similar to Solidworks.

You wont need to stitch something, all Industryfields that handle Nurbs can work with these files like they are. I never had any problems with them.

Trick is to enter subdivs first and after that converting it to subdivs NURBS will work propper
Rule:
NO TRIS and enter the Polycount when converting to Nurbs in the fields in conversation panel...

you can ask if you stuck but mainly that will give you access to the rest in 95% of the modells.
If it dont work MAYA always tells you why so read the Messages very carefully.

NO other tool can do that what makes Maya my next 3D Tool i will add to my Pipes with a license

Rhino cann be used to prduce best Nurbs TEXTS and Letters, try it also when you need TEXT or Letters..

Hope this get you going and feel free to ask

regards