You mean all you need to do just joined and merged the patches u want to convert
the result polygon objects would be closed without any tiny holes or gaps on them?
what if it does,OMG sounds very...
sorry for keeping u wait
coz i'm learning alias recently
i just wanna improve my skill
and make my procedure more efficiently
and thanks for your kind words my pal
i used 3ds's nurds tool too
that's a biggest reason why i jumped to maya :0}
but i konw even maya's nurbs tool might be better than 3ds's
it still not good enough,
so i gave up to model my car...