@Halvhjearne My preferred method is indeed to preserve the original hardware so that changes can always be undone.

Maybe there is another way. I did managed to mod 2 original gameboy advance with ags-101 lcd mod and custom made micro usb charging lithium battery option without destroying the original shell. I think i will buy 2 SNES USB adapters to begin with and then i can always look on the internet after other options as well and they are pretty cheap on ebay.

Thanks for your opinion. :-)