So my mod is now complete after a very long day yesterday. I must say though that I am very happy with the result, even though it's my first hardware mod, and I had a friend help out with the soldering work. Please don't laugh if it looks like a hack job
The points on the 3DS XL are smaller than people made out in this thread though.. But it all worked out in the end. So we managed to get the connector completely behind the battery cover! So with the cover on its just a regular 3DSXL. Made a custom cable using old IDE cable, small 4 pin connector and microSD to USB adapter.
Everything went pretty smooth really, and now I have my 4.5 for Gateway backed up. RARed it and put it in Dropbox (compresses to 340 MB). And updated to 6.3 to play Pokemon! It takes around 4 mins to go back to old firmware, when I want to use Gateway.
Anyway, very happy now!
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