[Q] Clarification req'd for flashing rom using Heimdall

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I'd like to flash to this rom GT-I9100_CPW_I9100XWKI4_I9100CPWKH1_I9100XXKI1.tar which I got from Intratech's thread as I want the older bootloader. I cannot use Odin as I run Linux and don't have access to a MS machine so want to use Heimdall.

Heimdall is installed and I've got as far as extracting the files from the above tar and have the following files.
Sbl.bin
boot.bin
cache.img
factoryfs.img
hidden.img
modem.bin
param.lfs
zImage

My questions are:
Whether I need to flash all the files in that list? I assume yes.
Heimdall offer the option of flashing primary and secondary boot loaders spl1 and spl2). Is Spl.bin above the primary or secondary bootloader?
Heimdall also requires a PIT file. I assume I should use the PIT file that I saved off my device?

I did do a search on here and google but found nothing that really answered all my questions so would appreciate a more knowledgeable person offering their advice.