Ok it is kinda working, it seems I need to do a lot of editing to the github files to make it work nicely with the original retropie install as various default directories are different in this alternative emulationstation.
This isnt as straight forward as I thought it would be lol

@bigbellyman worked like a dream . I approached it slightly different. Copied the theme I wanted to edit to my pc and edited it all there and then copied it over no problems.

@mitu Thanks for all mitu. I'm going to test that just after a complete SD backup ;o) !
See you.

@hex Ok, apologies

@Robotechvfx That’s a really nice image- I hate to ask, but can you post a link to it? I’d love to use it on my system.

@Bigdude

The instructions state "Remove Border Before Use". Does that mean to cut the white border between the design and the edge of the sticker off?

Yeah that's what I did with mine. Cut the white borders off before I stuck it to my case.