Hey Ed, a pipe cutter might work but they're actually quite thick walled tubing so it might take a bit!
Good old drop saw does the trick on the tubes. I chamferred the edges for better weld penetration. Again there's plenty of meat to play with. They actually took a lot of amps with the mig to get decent penetration.
Hopefully the coil over sleeves are nearly as thick or it will be a bit tricky to weld without melting the sleeves.

Rob, I'll take some photos and measurements of the upper spring perch and the camber plates tonight. A fair bit of machining was required to thin out the top plate and spacer that goes into the strut bearing so there was enough thread to bolt the insert retaining nut on. Even still the top of the insert threaded section won't protrude through the nut. I'm going to put a grub screw in the top to act as a locking nut. Might make it clearer with photos I think!