Remember, an orbital or electric sander is a big help on sanding those blocks...just make sure you are monitoring what you're doing so you don't somehow sand through somewhere. Both Kevin and I did a LOT of saning in order to achieve that "slinky" Simla shape...don't be afraid to sand away to make it conform to both the top and side views. It should not look the least bit "boxy"...or even Taurus-like, (see attachment). when mine looked like this, I thought it too much a a huge Taurus look to it and continued to sand to taper it further. The final plan changes should result in a thinner nose section than the original prototype.

The side view curve of the spinner should be carried right through to the side view of the fuselage