The main board is in the middle, Bellefaire above, Pearlbrook to the left, and Spirecrest below. As you can see, it took up almost our whole table! Once we got it all set up, it worked pretty well! I ended up winning by a fairly wide margin, as I was able to get down a ton of production cards early, and my wife wasn't able to get many cards down until later in the game. All in all, it was a lot of fun, but the setup and teardown time was significant!
I read somewhere before receiving Spirecrest that the expansions are not meant to be played together. I think this may have been meant to suggest that playing them together can me more challenging as there is a lot going on.
I played with my wife and two kids (9 & 11) and we used both the Pearlbrook and Spirecrest expansions and included the legendary characters for the full out experience. There are a lot of choices playing with so many parts and pieces and it felt similar to Paladins of the West Kingdom as far a choice options go. You have a few limitations but if you start the game producing you'll be in good shape.
The Pearlbrook expansion feels the most disjointed from the game but pearls are challenging to attain and worth 2 VP at the end of the game. The wonders, which cost 2-3 pearls in addition to other resources, are also high in points at endgame and worth pursuing. You are only able to use the frog ambassador to visit the Pearlbrook spots which is why I feel its a little disjointed. I think having the choice to use the frog at any spot or use two workers to replace the frog meeple would bring the game together a bit more.
The weather seems pretty tough and we nerfed it a little for our kids. I need to review the rules again because I'm not sure we played the weather correctly even when we were trying to. Since you are easily rolling in resources by summer or autumn the weather does provide some balance to the game (weather does bad things).
The legendary additions worked out well as they do not add to your hand size but give a few extra options for your city during the game.