[Malhablada]

I used the grids to make my lids too. I use connectors and tons of cable ties all pulled very tight with pliars, and in my experience anything longer than three grids is going to need a support of some kind, so 2x4's and up.

A spare grid bent into a V-shape will work wonders for support, and you can stuff it with hay for your piggies so it's not just structural, it's functional. But you can also design in different ways so you don't need an in-cage support.

If you make a clamshell-designed lid, you can cable tie an extra grid in each corner of the lid, and they'll rest on the walls. If you tighten everything really well, that might hold. At least it works in one of my 4x2's. I'm not sure if a clamshell design would work in a longer cage than that, though.

The bent grids aren't that big of a pain when it comes time for cleaning. You can pop them right back out. If it's a non-stationary lid you're worried about, you probably won't need in-cage support at all because you'll have to stagger a grid over each end of the lid anyway to keep it from falling into the cage, and they'll rest on the walls and keep the lid up. Just tighten everything like crazy, because cable ties eventually stress, and everything will start to sag if you don't.