I'm not modifying the windows drive mbr, it may screw up things.
It seems there is no feasible solution .

Also, assuming that lilo installs properly on the slackware MBR, because the windows drive is SCSI I need to install a non-default kernel. But in the menu where one is ought to choose a kernel there is more then one SCSI compatible kernel, scsi1, scsi2, ...
Anyone know what to choose?

Does Lilo support SCSI disks?