Our team encountered “Failed to open” error which I believed may be caused due to the file size. There isn’t backup .skb file to try and recover, and have tried all other possible methods we could.
It wouldn’t hurt to purge unused stuff from the model and clean up the materials. There are many materials that are excessive in size. There’s no benefit to the very large texture images in SketchUp but they bloat the file size.
I reduced the file size by 36% doing that.
Also a lot of reversed faces that ought to be fixed.
As DaveR mentioned the file should be purged. The one I cleaned up and linked is purged. But it is still a ‘heavy’ model. Anything that is not being used should be removed.