Sheep in the shops seem either too big, too small, too few or too dreadful!
I'm working on a sheep project here in Canada. The plan is to make my sheep patterns of polymer clay, then make molds in silicone, finally casting the sheep in polyester resin.
I plan to make both individual and bunched sheep. I'm just starting - I've made one sheep so far and still have a long way to go on this because I'm concentrating on my human figures at the moment.
In N America sheep were shipped in double decked stock cars:

Were I modeling sheep for open cars like yours, I'd bunch them in tightly so they wouldn't fall all over the car. I suspect the real railways would have done this, but I'm no expert.
Ordinary stock cars had only a lower floor and were used to transport large stock. Many were divided into wooden pens for individual animals, primarily cattle, but also bulls and horses. Otherwise there would be a great deal of knocking about. If necessary these beasts might be tied to the timbers as well. An aisle down the middle was usual, to feed and water the stock on the long trips common here.
I saw a video of sheep being transported in an open car in Britain. The sheep were penned into the ends and their freedom of movement quite restricted. A shepherd sat between the folded-up ramps which acted as doors. In this case the sheep were packed in for what I believe was a short run.
You're lucky! If you pack them into typical British solid-sided short wagons you won't have to model the trickiest bit - the legs - at all!
Cheers from Toronto.
