After exploring the large island for a time (not yet fully done), I found a level 2 pig near the inland sea coast. Set up the following (dimensions are full wall panel) 5 x 8 long pig house, cordoned off at the far end 5 x 2.
Roof is 26 degrees and all interior partitions half walls. From the entrance 1 centre isle until it reaches the 5 x 2 area and left and right from it 2 x 1 areas.
When piglets are born, I push them towards the entrance partitions, smashing and re-building half wall as I go.
Feed red mushrooms six at a time to breeding pair, 2 separate stake walls surround the pig villa, the last one is a bigger area so I can plant carrots inside in the future, as well as having a 7 bee hive honey farm already.
So far, I stopped at having 14 boars plus the 2 breeding ones, 16 in total in a fully enclosed 5 x 8 area, but it only worked by pushing the piglets away from the breeding pair as soon as they were born.
In the mean time I practised blocking with Elkthyrs raids, went swimming a lot close by, cut the close trees.
Across the river from it (which leads to the ocean side) on a high plateau I am building now my main house with as much fortification as possible at this point, raised earth walls and stake walls, also leaving enough space for future metal working area and portal building.
On a different note, marked already 21 copper deposits, lots of tin and troll locations.