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Remove backing of old bookshelf. Strip off the existing paint with a planer or sander so you're starting with a smooth, clean surface. Paint the bookshelf the desired color.
Cut 12 strips out of the 3/4" x 3/4" mahogany, making each strip 11-1/2 inches long. This makes enough strips for three wine storage cubbies. Cut a slight 47-degree angle on one end of each mahogany strip, leaving a 1/4-inch flat reveal on the end of the angle.
Cut 1-1/2" x 3/4" mahogany (verticals) into 14-inch long pieces. You will need two pieces per cubby of wine, so we had six strips total. Attach one horizontal strip flush to the outside bottom side of two vertical strips with glue and 1-1/4" brad nails. Make sure the front and back are flush.
Attach one horizontal piece four inches above the bottom one. Attach the third horizontal piece four inches above the second piece. Repeat this process on the opposite side of the vertical. Make two more verticals exactly the same way for a three-cubby wine rack.
Attach one horizontal piece flush to the bottom of the interior of the cubby with glue and 1-1/4" brad nails. Attach another horizontal piece four inches from the top of the bottom piece. Attach a third horizontal piece four inches above the second piece.
Repeat this process so that all sides of the center cubbies have three horizontals. For this project, we repeated this process on six sides. Attach the vertical strips four inches from one side of the cubby using glue and 1-1/2" brad nails. Nail from the top and bottom of the cubby. If the cubby is more than nine inches wide, use additional vertical pieces and/or filler strips.
Cut 1-1/2" solid birch to the length of the top and bottom exterior ends of the bookshelf, and then paint the strips. Attach top and bottom facing using glue and 1-1/2" brads. Measure the spacing between top and bottom facing. Cut 1-1/2" solid birch to the length of the existing vertical dividers (not on the mahogany verticals). This project used five total.
Attach each strip between the top and bottom facing using glue and 1-1/2" brads. Cut the sheet of 1/2" MDF to the exterior dimensions of the bookcase for the backing, and attach it using 2" screws. Secure the rack through the studs in the wall using 2-1/2" cabinet screws.