Damien,
You are halfway round the world from my neck of the woods! I'm in Malta, Europe - so getting hydromotors over would probably cost an arm and a leg! My Bofors can be seen at
http://www.anti-aircraft.co.uk/Malta_Bofors.html
The outriggers are not mine and I am looking for a pair, or at least the jacks. I have 6" tubing to make up the arms, so if you have a pair of jacks....
Could you post some pictures of what you have available? Or
write me.
Best Regards
Godwin