If I were starting again, knowing what I do now, I would consider what, to me presents the greatest problems. I think that that is ease of feeding and access in winter.
So if you're planning on keeping your stock outside, even for part of the time, your biggest enemy is mud. That being the case, I wouldn't go for a cartwheel system because you would be concentrating your stock in the narrow part of the field, near the hub and that would soon become impassable to man and beast.
My ideal system would be to have the fields all next to each other in a row, with a fenced hardcore access track running along the bottom, with a gate from each field onto the track. Something like this.I=I=I=I=I=I=I - I know it isn't very clear! But what I mean is the = sign is the track (meant to be continuous) and the I is the boundary separating each field.
I would then have my main building at the other side (beneath) of the track or at one end of it. This building would be built with easy access from the road so:
1. Deliveries could easily get to your main building.
2. It's easy to feed the animals in the field - merely take the feed from the building, along access track and put over fence into feeder. As ground gets trampled down around the feeder, simply move the feeder along the fenceline a bit.
3. In order to move animals from one field to another, open the gate to the track and drive them along to the next field or into the building.
Obviously this can be refined with gates, handling systems in strategic places, or the animals can simply be run into the building for handling.