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Using 5 1/4 MDF, cut jambs and legs to size of frame-out with a chop saw. Make sure to measure from cut edge to make the frame-out square.
Cut to size the number of jamb legs needed to create the desired amount of shelves. These will be parallel to the legs of the frame-out.
Rip down the 5-1/4 MDF to 4-9/16 with a table saw. Make sure all jamb legs are the same width.
Use a router to round each edge of the jamb legs to create a smooth polished edge.
Measure the piece of stained glass in order to build the frame-out within the shelving unit.
Use 2-1/2" drywall screws to attach all four sides of the frame-out and jamb legs, making sure to pre-drill each hole before screwing together. Once everything is in place, insert the frame-out into window opening.
Using shims, make the frame-out level, and secure it to the wall using a framing nailer with 2" framing nails.
Once leveled, put the pegboard up against the inside of the MDF where the shelves will go.
Drill out the desired amount of holes and the desired width, allowing you to make floating adjustable shelves.