Factors to consider when setting it up :
. it's really helpful to have a route to get ewes-and-lambs in and out of the shed without opening the main area (where those yet to lamb are.) So some sort of 'airlock' pen in the entrance, which opens to the outside and to the inside, will be useful.
. Your wee ewe lambs maybe won't be such a problem, but with adult ewes it's very helpful if you can put feed in troughs before letting the sheep to them. So either two main pens, with troughs sufficient for all in each, so you can shoo the sheep into one before putting the feed out in the troughs in the other, or walk-thru troughs, or troughs along one side with a passage you can walk along behind it.
. with hoggs especially, having the lambing pens not far from / in sight of them main area will help when trying to get lambed ewes to follow their lambs to the pen
. again, with hoggs especially, you will want some larger pens where two or three mums and their 24-48 hour old lambs can go, and can learn about mothering up in company, before being put out. Your sheep look docile enough, but anyone with hill / primitive sheep be aware that ewes can be very aggressive with other lambs, so this tactic has to be used with caution, especially with horned sheep.
. lambing pens may need a lot of mucking out, so think about forking and barrowing when you plan your layout! And also carrying water to ewes in the lambing pens.
. again, especially with hoggs (but less with the type you have than with first-timer hill sheep and primitives), you may need a few lambing pens where the lamb can get to safety if the mother is having a hard time accepting this little bleater tugging on her teats.
As a rule of thumb, I'd divide a space into 1/3 mothering spaces, 2/3 main areas and lambing pens. Lambing pens around two sides of the main area, perhaps? Main pen divided into two to help with feeding and general management. 'Airlock' arrangement at main entrance.
Let us know what you do and how you get on with it!