Ok with your hog tractor, you could make a fence with bamboo or wood with wood vertical and horizontal interlinear one between other the bamboo horizontal.
it would be but it is to hard you only go to buy the hog tractor and easily building a fence for your pigs it is easily and do not expenses a lot of time in work hard but if you do not have money it would be.
We build something like a hog tractor with metal and wood it was very expensive around $150.00 including the work and was for only have around 8 hen with a chiken and we continued work for be better conditions for it.
make your life more easy it is the actitude i love the homestead life but i work in a city but dad an mom live in the little farm and i every day think how be better quality of life for them 63 and 82 yeard old, daddy it is very energic more than me. :( maybe the farm life is the best for you healthy and lifestyle it is very hard hard but very nice.
Best regard.
@galberto