Getting pig to work to prep the garden

My partner and I recently bought some land, and even though we're not able to move there quite yet, we've tried to get a head start on a few projects.

One of them is getting the garden plot ready. The previous owners had their raised bed garden in the same spot, but no one has lived at the property for at least 5 years, so everything was overgrown with grasses and brush. We fenced it off and made it into a summer camp for our friend's pig, who has been rooting and digging for the last couple of weeks. The area is pretty large and so far the pig hasn't even got round to digging it all up (almost there though!). I don't have photos of it on me but I can get some if it would help. We've had a relatively dry summer, so the soil hasn't turned to mud, there are no big holes to speak of - generally speaking it looks like Mr Pig is doing a fine job.

What we're wondering about is what steps to take next. I have been reading posts here & elsewhere recommending to follow up with chickens to even the soil out, eliminate weeds and bugs. I'm not sure if we will be able to do that - is the next best option for us to rake it evenly? We're trying to only use human or animal power.

After that, what about the winter? We are in Maine, and in the next few months temperatures will drop and we will start to get snow and frozen grounds. What would be recommended to overwinter the area successfully? A thick layer of mulch/woodchips, or will the pig manure be enough?

Any comments or suggestions on the topics are appreciated! We are still somewhat new at this :)

Thank you and much love!

coastal Maine - zone 5b/6a

I don't have experience using a pig to do prep work.

What I want to offer or suggest is that a good winter mix would be good.

Here is some great information:

that fall we broadcast seeded the whole area (2 acresish) with daikon radish, crimson clover, hairy vetch, and annual ryegrass. Those are all soil builders by the way. Anyway this spring was amazingly green and lush it was lovely compared to the way it was just a year and a half ago. All that stuff completely smothered all weeds this year, especially the hairy vetch it worked wonders on suppressing native weeds/grasses. We let it all go to seed and turn brown. By June-july it looked like we strawed the entire hill cuz it all died off due to heat. We then broadcast seeded buckwheat and sunflowers to get some cover for the rest of summer.

https://permies.com/t/165432/Advice-swales-property#1304316

I once read about dried corn being added to cow manure piles. Then the pigs were let in and they happily tilled it to get the treats. This turned the pile from a nasty anaerobic mess to nicely turned aerobic compost.

I wonder -- would scattering some sort of grain encourage the pigs?