Here we go then.
The first insert I put together was for Catan. I wanted to give it a go so I could get an idea of what to do before building up the Brewcrafters insert. It probably ended up being the best of the three builds.

The instructions all fit on top of the first shelf, which holds the player pieces & terrain tiles.

Removing that shelf reveals the second, which holds all the other pieces of the base game.

The two card holders are removable to make the job easier for the dealer and to reduce mess.

The bottom layer holds all of the pieces for the Oil Springs, Frenemies, Helpers of Catan & Wedding Tower mini expansions, as well as a bunch of VP tokens and some blank number discs. I also have The River mini, however it was too big to fit in anywhere here, so I've stuck it in beneath the terrain hexes.

The next project was for Brewcrafters, a game very similar to Agricola based on the theme of building a brewery. As previously mentioned, it comes with a tonne of components, but no insert whatsoever.

The first layer is divided into eight parts. On the left side here there's all the ingredient cubes & multiplier markers. Top right holds cash, point tokens separated by value, worker & recipe cards, etc. At the bottom on the right are six small boxes holding the starting hand for each player. Their contents are all slightly different to compensate for first player advantage.

Removing those eight parts reveals the tray of beer on the right hand side, and the rest of the misc components in the tray on the right. Underneath that tray sits all of the player and game boards.

All of the pieces together. Again, all of this stuff just came with a small amount of baggies. Super unhelpful.

To conserve space, the boxes holding the individual beer tokens are all made from card held securely in a foamcore frame. The beers are colour coded: black for stout, brown for porter, cream for ale, and white for the starting beers.

Lastly, Roll for the Galaxy. On the left hand side, from top to bottom, we've got the objective tiles & bag, the starting faction tiles, the cups, the phase markers, homeworlds, then the planet/tech tiles. It just so happens to fit the exact number of tiles from the base game, Ambition expansion and the gaming grid promo. Nice. On the right is a pull-out tray holding all of the dice, vp chips, and vp/* chips.

There's a coloured piece of card bent beneath each of the piles of dice to make it easy to scoop them out. It bugs me to no end that each piece of card happens to be the exact same hue as it's corresponding die, with the exception of the brown.

Underneath that sits everything else. The cash marker, shields, plateaus and phase selection sheets. They look a bit like they're all just chucked in here, but they're actually very sturdy and keep each other in place.

It seemed a shame to throw the two inserts away, so I decided to chop em up and use them as a base in stead of a sheet of foam. The original on the left and the expansion on the right.
I've still got a couple of sheets of foam left, but no game that would benefit that much from a new insert yet.