Select the cover depending on how many channels you are using (i.e. channel 1 to the highest number used). If it does not fit, change channels_used in the dim spreadsheet and/or the sketch005 in FreeCAD.
I added a holding fixture to the casing and the cover. I also created a version of the cover for the Losi Lasernut that can be screwed (tap a M3) directly to the rear shock tower.
PETG or resin for the Case, TPU (flex) for the Cover; see 3mf attached for more details. There's a manually supported STL of the Lasernut version also.
The author marked this model as their own original creation.