These are valid points and I might just consider giving it a go after next reset. I also never thought a couple of months ago that I would go the effort to create a setup skelespawner - but I have the last couple of resets :)
Thank you @RailefBear for sharing this valuable information with all of us.

 

Thank you for the tutorial, is of much help!

 

I must find a spawner *enters nether portal*