Have you worked out your costs ? Do you have one or two people in mind. How reliable are they? Because at the end of the day its a huge committment. How will you cover sickness, holidays, will they want double time for working BH, assuming they will work.
As above all the points made by Collie 26. Have your costings included all the unexpected. Ie. what if your crop fails? Vet bills, or the worst of all the loss of one or more of the piglets, either from theft or death. If the pigs are not close to your home, you have the extra costs of fuel to and from, and the risk of theft. If they are only being checked only twice a day (assuming the reliability of your workers) it could be some time before you are aware of a sick pig, or an escaped pig.
On paper it all sounds great, may I respectfully suggest you get some hands on experience with a smallholder, to see the pitfalls as well as the bonuses of pig keeping. Personally I think paying someone else to rear your pigs takes away the whoe point, as for me and I think for virtually everyone else on this site the pleasure of keeping the pigs is at least as important as the profit made.
Even were you able to rear your pigs totally on home grown food, taking into account the costs of same, assuming you have a tractor, milling etc. plus the costs of your employees, I dont see how you can even begin to break even. I would be really intereted in your costings.
I wish you the very best of luck should you decide to go ahead, but think you would be financially much better off paying someone who already raises pigs in an ecologically sound way, to grow one for you to slaughter.