Hi how :)

With nurbs I sort of try and break down the elements of a model to basic geometry where possible.
I try to use solid modelling as much as I can and if there is no other choice then I get to the surfacing side of modelling.

Another way this can be done is you use Construct>extrude for the top cross, then apply Construct>fillet>chamfer to the edges, highlighted in the picture.





Cheers