Hi Peter,
You might have more luck posting on xda-developers or something, but in case it helps I had a similar looking error on my Nexus 4 a few months back when I tried to flash Cyanogenmod 12 (based on Android 5) without updating my Recovery first.
The newer Recoveries seem to allow different partition sizes depending on Android version, so the Recovery that worked with Android 4 caused size related errors on Android 5. The /system partition just keeps growing with each new Android version!
I don't know what recoveries are popular on Samsungs, but maybe flashing the latest CWM or TWRP and trying again might help.
Hope it works out,
Angus
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