Making custom skins.

[MutantAura]

Ok so to start this off I'm not experienced in the slightest with json so this could all be a simple issue that I'm just not seeing. I am attempting to make a GC display that is a bit more condensed horizontally so it fits nicer into my stream. I have the png files needed and as I'm not too confident starting skin files from scratch I used the default GC skin files and json file as a starting point. Having changed all my custom PNG file names to match the GC skin names as to reduce name changing in the skins I thought it would be done (albeit with very wacky button arrangements all over the place). However upon launching it simply crashes the program. I am going to assume this is due to some conflict somewhere or that one of the buttons is out of range etc. but as I say I really am a total noob so any help would be appreciated.

Edit 1: Ok so on second try I can replace everything piece by piece other than the base,png file, when that gets replaced it crashes making me think its a size issue?