I want to be able to combine nurbs surfaces so I can freely build something and then piece the parts together as needed, so far I have tried the stitch and fusing of points for this but neither seems to work in this case, would appreciate if anyone has any info on this.

You need to be aware of the uv domain of your surfaces and their direction. The stitch is pretty straightforward provided you know the above. I've attached a real simple example.
You need to remember to turn on the stitching, with the toggle near the bottom of the parameters, and if you wish to control the tangent of the join then turn that on as well.
For controlling the uv domain the Primitive sop is very handy.

Also for joining two or more surfaces (or curves) into one, check the Join SOP.

Dragos

thanks for the help, will look over the file you attached, hopefully I can make some sense of this.