Here's a Mel I made to speed up initial UV creation. It automatically creates oriented UVs for the selected meshes and a UV layout for all the objects in the current selection on a single texture sheet. It cuts hard edges and uses the new Auto Seams command (Maya 2017 Update 4 or 2018) to create UV shells which it then unfolds, orients and finally packs with Layout UVs. It might require careful examination and some cutting and sewing and potentially repacking afterwards but it gets you 85% of the results with 1% of the effort
Something like this:
The script is free on Gumroad >>here<<
I've written a more detailed blog post on how to install and run it on my Arstation >>here<<
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