Looks like I might be too late, but I created a .dxf file of the mini playfield protector a while back. You can take the file to any local plastic shop and have it cut out of acrylic or any material you like. A link to the original post and file is below:
https://pinside.com/pinball/forum/topic/twilight-zone-owners-club/page/76#post-3713671
Capture (resized).PNG