Thanks ucupsz, that was lots of help.
Yes I was using your kext but I had multiple other failings. This includes initially installing in safe mode, problems with the bootloader (as myhack would not run fully in safe mode). Then of course I was trying to use Mavericks whereas really I should have stuck with ML.
In the end I recreated a ML installer with myhack and the kexts provided on the site here for T430, then I added your kext and the device string you use into the org.chameleon.boot.plist file. I've only just completed a working install and now to check what does/does not work and performance test.
Are there any outstanding known problems like sleep/sound etc?