In my view, Castle Sweet Castle was an... okay episode. I was vaguely dissapointed by it. For me, it could've been more, and more importantly, it could've been a Twilight episode with more sympathetic characterization of Rainbow Dash (keeping tons of her trophies in her house seems in character for her; dumping them on someone else, not so much) and Rarity, as well as a more focused plot.

I think a lot of it was the Spike subplot, which ate up time for more Twilight in the plot. The Ticket Master showed that you can have a Twilight POV episode involving the Mane 6 and Spike as the primary plot-movers, so why not this one?

Yep, time for a revisionist view of the episode!

Here's how I'd do it.

First part of the episode is the same, except that when Twilight admits her desire to avoid the castle, Rarity gets a bit more involved. While secretly a bit jealous of the gem-studded castle, I'm sure, Rarity is very good at understanding her clients' style, as Suited for Success demonstrated. She quickly connects the dots and aims at recreating the look and feel of Golden Oaks Library.

"Is that what I've really been missing?", Twilight absently asks, but is quickly persuaded by the chorus of her friends all chiming in that yes indeed, that's what she's been missing! Let's chop the wood now! Song about working together!

Except for a certain colorfully-maned pegasus.

Ever notice how barren RD's home is? She's never really been the type for sentimentalism, and something about this really stinks to her. She, naturally, butts heads with Rarity, but Twilight remains the viewpoint character here, providing a note of indecision between going with a plan that sounds really smart and her friend Rainbow Dash having some sort of big problem with it.

When Rarity's plan is completed, Twilight realizes that RD's gut feeling was onto something. The castle feels like it's constantly, hollowly reminding her of a place that simply no longer exists. An attempt to hang onto the past, too much. Spike sadly notes that the grain of the wood isn't the same, Twilight looks up at the tall tall ceiling, the walls echo differently, all these little wrong details end up speaking all on their own for RD.

So Rainbow Dash gets to do things all her way. Tear it all down! All new! Everypony pitches in! Rarity doesn't particularly like where this is going, mind you, and Twilight too, and things end up in the same kind of mishmash as was depicted in the actual version of the episode.

What now?

Maybe... the Mane 6 could look for what each pony's approach did right?

They come to the burnt down original tree, and have an idea, and the rest is history.

You can't just replace the lost things in your life, but trying to act like they never existed isn't a good solution either. The best way is like the chandelier; to take the lessons from the past to look forwards into a new future.

And that's the solution/moral things end on.

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Plus, we'd get more RD and Rarity interaction!