The casings are very roboust, sheep skins are meant to be better but very delicate.
Stuffing by hand no idea, best bet you-tubing it to find techniques.
BBQ'd them last night round a mates after fence building all day. Very good indeed, they didn't explode, the hog casings were nice and tasted great. IMO needs more spice mix/seasoning. Also need to look at some other boewore recipes, I felt a flavor was missing.
No photos, however still got 8 left in the freezer so when I cook them I'll try and remember.
People should try making there own, as I said surpringly easy. Need to stuff them slightly less and twist more carefully as they where all random sizes.
The other two sausages I had planned are on hold, been so busy, didn't get round to making them and the meets gone off

sad days, what a waste of money.
And I absolutely have to make dragon sausages (leek and chilli) , heavy on both.