Grind off the old plates: (be sure NOT to cut in to the beam itself)
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Nice and clean axle, ready for the astra plates:
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Difference between nova(left) and astra (right):
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Astra plates welded on the nova beam:
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You might want to cut some slits in the beam like this (and bend the thin end outwards):

Otherwise the bolts will be very close to the beam (i modded the bolts):
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Finished:
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On the car with new brake pipes (old ones can be bent to fit...but it is not 100% guaranteed to work, you could snap them wile bending)
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'91 Nova long cable, '89 Cav 1.6 short cable extended with a piece of threaded bar (M8)
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The bias valves i'm using are the originals mounted on my nova van (3/30)
My advice: source a second rear axle and take your time...
Cheers, J
Complete manual can be found
HERE
Manual is written for the complete kit...using astra handbrake cables.