Step 3A) Enclose the stall: Planning
Since all of the surfaces inside the enclosure will get very damp during the shower, you don't want to have any unprotected wallboard or plaster inside the enclosure. Normally this means that the Plexiglas lid should go right at the top of the existing tile or fiberglass, low enough that any wallboard is above the lid. If that means you'll bump your head, see step 23 for some other options.
Measure the size needed for the Plexiglas carefully. It needs to be big enough to sit on top of the tile or fiberglass around the edge of the stall without falling in, but small enough to fit between the walls.
If there are three walls where the Plexiglas can sit on top of the stall, the support for the third side can be a simple piece of aluminum angle extrusion. If there are two sides that need added support, it may be necessary to add a support for the corner between them--either a leg going down to the outside of the stall, or a cord hanging it from the ceiling.
In some showers, the showerhead comes out of the wall above where the lid will sit. That's OK--it just means you'll need a hole in the lid for the showerhead to come in.
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