Been meaning to add this for awhile but hadn’t done much scenery after being distracted by aircraft but got back into gear after adding the LEGO AT-AT and Marshmallow Man recently.
Found a good model on Sketchfab, imported to Blender, made some checks for scale, exported to gltF format that MFS requires.

Checked in gltF viewer. Noticed I forgot to set the textures so came out looking like below.

After setting it and re-exporting, packaging in the game, I placed in the location I wanted, set the scale etc.

This is what the final scene looks like:

Test flight around it to check it shows up OK:
Available for download here as part of the “Star Destroyer in Sydney” file