Matterhorn mountain with mystery inside!

I realize that this gives non-manifold errors.  I am not sure how to properly create holes in a model and additionally, the hoop and backboard connection as soon as they touch becomes non-manifold.  I've given up and accepted this is as good as it gets.  Slicing in Creality 4.8 had to disable union overlapping, remove holes and remove mesh intersection plus enable Keep Disconnected faces for it to slice mostly correct.  The holes in the model are still getting filled, so I will drill them out post print.

I do pause the print over halfway through to paint the interior then resume the job.

Legend has it that Matterhorn mountain has many mysteries within it's cold, dangerous caverns!  Enjoy!