Sift the flour and salt into a bowl. In an electric mixer on high speed, beat the butter and sugar for at least 5 minutes until it turns pale and fluffy. Add the ground almonds, then very gradually the eggs, mixing well between each addition. Fold in the flour with a large metal spoon and then the soaked fruits (and any liquid) and nuts.
Spread the batter into the pan. Bake on an oven rack in the lower third of the oven for about 2 1/2-3 hours. If a wooden toothpick inserted into the center comes out clean, it is ready. If it browns too much before it is fully cooked, make a circle of foil a bit larger than the cake, pierce a hole in the center and open it up, then place it over the pan.
Let cool in the pan. Pierce all over with a wooden toothpick and evenly sprinkle over the remaining 3 tablespoons brandy. Remove from the pan and discard the paper. Wrap in fresh parchment paper, then aluminum foil, and let stand for a week or up to three months. Unwrap and sprinkle with with 1 tablespoon more brandy every other week, if you like, for extra succulence and booziness!
Preparing the Wedding Cake Boards and Pans:
Thin cake boards are used only while you are assembling the cakes, and really serve to save your work surfaces. You can use any board you have, even plywood. Thick cake drums are used to support each tier of the finished cake, so must be bought for this purpose.
Prepare the cake pans and batter (see above). Divide the batter between the pans, filling each to the same depth. The smallest cake will take about 1 hour and 45 minutes, the medium 2 1/2-3 hours and the largest about 3 hours: if a wooden toothpick inserted into the center comes out clean, it is ready. Let cool in the pans. When cooled, pierce all over with a fine wooden skewer and sprinkle with the brandy. Wrap in fresh parchment paper, then aluminum foil, until ready to use. You can continue to feed the cakes with 1-2 tablespoons brandy every other week, for a month or two.
Using Marzipan for the Cakes:
Take the 8-inch thin board and place the 6-inch drum on it. Brush 1 tablespoon apricot jam into the center, then place the 6-inch cake on top, upside down so the flat bottom forms the surface. If it is slightly smaller than the drum, make a strip of marzipan as wide as the side of the cake and the same circumference, and stick it to the edge. Similarly, all cakes should be the same height. If not, apply an extra-thin marzipan layer to the top of the shallow cake (use the pan as a guide). Repeat for the other cakes, placing the 8-inch cake on the same-size drum and 10-inch board, and the 10-inch cake on the same-size drum and 12-inch board.
Brush the 6-inch cake with jam. Knead 1 3/4 pounds of marzipan until pliable. Sprinkle a work surface and rolling pin with confectioners' sugar, and roll out into a rough square slightly larger than the top and sides of the cake and drum and about 1/4-inch thick. Lift on to the cake and drum, smooth all over and cut away any excess. Cover the other two cakes, using 2 1/4 pounds marzipan each. Leave overnight to firm up.
Items Needed for Cake Construction:
12-inch square (1/2-inch thick) cake drum and eight wooden dowels
Ingredients for Covering the Cake:
Confectioners sugar, for rolling
9 pounds ivory fondant
2 tablespoons brandy or boiled water
2/3 cup royal icing in a parchment paper cone