I've seen good complete Victa power torque mowers at the side of the road Norm but haven't bothered picking them up , until i get all the mowers out I don't know how many bases I have to give you could be 20.
I wouldn't buy new bushes for $5. I have a heap of them.
Yep the 24 blade plate is worth a bit if buying new even second hand.
Cutting the plate out with a angle grinder then using the lathe I would have thought would be cheaper than laser cutting as long as the lathe is big enough to fit the blade plate.
I was thinking you could adapt another victa plate to fit by welding a small centre flat plate on then machine the centre out.. Rover have a big plate that may be adapted.