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Plywood is absolutely the best choice IMHO. Thinking of it as a beam, the plywood piece in the vertical orientation is exceptionally strong since it will be about 8-9" - practically no deflection for your intended purposes as a decorative niche.

I would consider how to hide the joints - if it was me, I would space them so that it makes it look as if it was part of the design. Perhaps use a piece of molding, like a quarter round where the joint is to be hidden or something similar to your tastes.

For a piece that is that large you would want to consider it being trim color or wall color to be a backdrop and not so much a focal piece as the intended items on display should do that part.

Plan on having a recess on the underside for your wiring that can be concealed, keeps it looking clean underneath and if you should need drapery in certain areas, it will prevent a snag.

The t shape you mention - if the space between the front of the T is adequate, its a popular place for crown to be installed. If your room already has it or you are planning on adding it, you might want to skip it as it can be overkill.
 

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His recommendation of joining the ply in three equal lengths is a good one. IMO, the best method would be with a half lap, and you could make the overlap a bit long, like 6" or more. Once glued and clamped, the total length would be as structurally sound for your application as if it was one piece.


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An excellent idea on the half lap. You could probably then get away with routing a small v groove as an architectural detail instead of using an applied molding.

Let me illustrate the T with crown concept:
 

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