Internal tray for short 4" enclosure

Hey guys,

Been a lurker on here for a few weeks and have learned a ton, but now running into questions I can’t find answers for.

I’ve got a build in progress based on a 4" locking WTE in the 200mm length, which I love for it’s compactness, and I’m trying to mount a tray inside for electronics. What’re some options you guys have used for trays?
The WTE seems too short for the BR tray option. I could always bend/cut some tie plates from the local hardware shop, but I’m looking for more elegant solutions first. Thanks if anyone can help!