There are a couple of other mistakes in the map, besides what
@Tarabas pointed out.
Gaeta and its surroundings is the the kingdom of Naples, not in Latium as it appears (nowadays Gaeta is in Latium, and what is shown on the map is the modern administrative border, but the change happened only in the late 1920s, after the reclamation of the Pontine marshes). Romagna should be included in the Principality of Adria, to balance things a little better. I don't understand the survival of the kingdom of Lombardy-Venetia: the referendum in Lombardy (and the one held a bit later in Veneto) returned an overwhelming approval for annexation to Sardinia (incidentally, when CA dies, VE gets crowned king of Sardinia, not king of Piedmont), so there is no reason to maintain the government structure that Metternich set up after the Congress of Vienna.
There are however reasons to have a duchy of Milan (governing Lombardy) and a duchy of Verona (governing Veneto and Friuli up to the border): there would be a single parliament in Turin for all of Italy north of the Po (which would facilitate the integration in terms of infrastructures) plus Liguria and Sardinia; having Milan as both the capital of a kingdom and the capital of the Confederation would be too much (Milan will increase anyway in importance on its own, for geographical and economic reasons); it would avoid antagonizing the people of Veneto, which had been governed from the Austrian viceroy in Milan, and would not see any improvement on the past.
There is another very practical reason too: if Lombardy and Venetia are integral part of Sardinia, Cavour could well follow his habit of keeping multiple portfolios, starting as minister for Commerce and Finance (which are two very critical things to improve) for both Sardinia and the Confederation, with Balbo Prime Minister of both (same as Bismarck did IOTL, with Prussia and the NGC first and the Reich after 1870). When Balbo dies or retires, Cavour will smoothly step into its shoes. If there is a separate kingdom of L-V, all this becomes much more awkward (not to mention that diluting the importance of Piedmont and Savoy by the addition of two populous region would be a good thing in itself).
I also fail to understand the reason to give CA an extra 6 years of life: leaving aside the fact that CA's death was caused by liver failure (which cannot be cured or even improved by his better performance in the war) and not by a "broken heart", as the romantic legend goes, keeping him alive longer does not help the narrative (apparently he doesn't do anything worth of mention in these extra years) and put on hold for an extra 6 years a lot of thing, such as Cavour's political career and the economic development of Northern Italy (the years between 1849 and 1852, when he became PM, were very productive in terms of boosting commerce and starting infrastructures).
A last nitpick: the first thing VE should do after getting crowned is a tour of the Confederation members. He still needs a minder to go with him, the man was a bit of a rough diamond