Line with plastic wrap a 8½ x 4½-inch (1 liter capacity) loaf pan. Set aside.
In a heatproof bowl, whisk the whole eggs, sugar, salt and vanilla until combined.
Set the bowl over a bain-marie (simmering pot of water) and whisk constantly for about 5–7 minutes, until the mixture becomes pale, thickened, and slightly warm to the touch (about 70–75°C / 160–170°F).
Remove from heat, and let it cool to room temperature.
In a separate bowl, whip the cold whipping cream until stiff peaks form.
Gently fold the whipped cream into the cooled vanilla mixture in batches, keeping as much air as possible.
Transfer a bit less then a third to the prepared pan.
Add spoons of raspberry sauce and chocolate ganache in a scattered pattern.
Repeat the layering with more vanilla base, raspberry sauce, and ganache until all the components are used up, finishing with a layer of vanilla base on top.
Cover the pan with plastic wrap and freeze for at least 6 hours, preferably overnight.
When ready to serve, invert onto a serving platter and remove the plastic wrap.
Garnish with fresh raspberries.
Cut the semifreddo into slices, and serve with remaining raspberry sauce, chocolate curls and fresh raspberries.