Shendrones Ichabod Jr 2.0 FPV Frame
Ichabod Jr is a 255mm quad with 6mm arms, a 3mm bottom plate, 2.5mm mid plate, and 2mm top plate. It shares its arms and motor layout with the Hydrophobe. Stack height is 20mm. Frame weight without printed parts is 124g. A full set of printed parts (Hero8 mount, DJI antenna holders, Crossfire diversity mounts) is 48g.
You can print your own parts, files are here.
Although an older frame and not high tech like the newer stuff for what I needed for this thing, checks the boxes and is pretty stout