Here’s pictures of the next step. If you know the size of your track, this step could be done before installing glass.
Put wood in behind the glass. A 3inch strip up top, 8inch on the bottom. Here’s a tip. All screw heads should be outside the enclosure. Took 4 under, 2 on each side for lower strip. 4 on top, 1 each side for upper.
Can use speed square here to get the strip square with the glass vertically before measuring inset and drilling. Having it square vertically, and inset equal on both sides will give a uniform small gap. Without rubbing the glass. Aim for 1/8” gap between wood and glass.
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