hello, I am stuck with this specific model, despite repeated attempts I am unable to model the internal of the Sphere. A little background I am 3 month old user of solidworks and preparing for CSWA, during the course of my prep I downloaded a few practice model  from internet, however I got stuck with this particular model with respect to modelling inside the sphere. It would be a great help if i could learn the ropes to do so

Thanks

a side note; the dimensions in the solidpart are not as per drawing as during multiple tries i kinda let them loose to focus on the technique