Hi there..
We were in the same position as you not that long ago, and all of our pens were based on 10x20 ish dimensions. I had 4 paddocls of that size i.e 2 and 2, with two pig arks divided in the middle giving each paddoc access to an 8x4 ark. I used on the forward facing paddocks for three Tamworths, and 3 large blacks, moving them to the rearward paddocks when the front got a bit grubby!
it worked fine! They were very happy and fattened very well. I have stuck with the blocks of 4 10 x 20m and have since built 2 more blocks giving me 8 paddocks. I have a 'departure' paddock about the same size which allows me yearround trailer access, and two more 10 x 20 m electric paddocks as overspill. We have 10 sows and a couple of boars, and all seems fine, a bit muddy but fine. As pigs go I rest the paddocks, planting any old stuff, grass seed etc in the soiled ones.
I worm regularly and have had no illness thus far, so I assume all is well. I have travelled around and seen lots of different set ups all variations of ours, all hugely muddy!
Give it a try, I think your on the right track, but be prepared to use the orchard is the mud gets too bad!
Regards
Jason.
P.S. I am not trying to undermine anyones idea's but I do love our pigs, and they are genuinly well and happy!