j tan()JTAN
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Steps:

  1. You need a working openbsd machine on which to compile and build ISO images.
  2. Make a directory in which to keep the cd's contents, such as /bootcd or similar. If you can make this a separate partition, so you can boot it for testing, all the better.
  3. Untar base35.tgz and etc35.tgz in this directory.
  4. Make sure the kernel sources (/usr/src/sys) are installed on the machine.
  5. cd into /usr/src/sys/arch/i386/conf and copy the kernel config file GENERIC to CDBOOT or similar. Working CDBOOT config file.
  6. edit the file CDBOOT. Replace the include of ../../conf/GENERIC with the contents of that file.
  7. make the following changes to CDBOOT:
    1. add the options RAMDISK_HOOKS and MINIROOTSIZE=3560 to support ramdisks
    2. comment out the line config bsd swap generic, as there will be no disk to swap to
    3. add the line config bsd root on cd0c to allow for / on the cd
  8. run the command "config CDBOOT"
  9. cd into ../compile/CDBOOT and run make depend and then make
  10. copy this kernel into /bootcd
  11. edit the file /usr/src/distrib/i386/common/Makefile.inc, replacing the lines 
            strip ${.OBJDIR}/boot
        strip -R .comment ${.OBJDIR}/boot
    with the line 
    strip --strip-all -R .comment -K cngetc bsd.strip
  12. cd into /usr/src/distrib/i386/floppies
  13. create the directory CDBOOT as a copy of ramdisk_cd
  14. edit the makefile in CDBOOT, changing the line RAMDISK=RAMDISK_CD to RAMDISK=CDBOOT
  15. do a make in /usr/src/distrib/crunch and then /usr/src/distrib, to setup some prerequisites, then do a make in /usr/src/distrib/i386/CDBOOT. copy cdrom35.fs to /bootcd/boot.img, this is the image you need to make the cd properly bootable.
  16. change /etcs to make booting work right
    1. Edit the CD version of /etc/rc to mount the floppy on /etc, then run /etc/rc off the floppy or run the installer if it doesn't exist. working CD rc file
    2. edit the floppy version of /etc/rc to mount the appropriate filesystems. (which is in /usr/local/jtan/floppy/rc on the cd) working version
    3. edit the CD version of /etc/fstab to include the cd and the floppy
    4. edit the floppy version of /etc/fstab to include the cd and floppy, and all ramdisk filesystems (which is in /usr/local/jtan/floppy/fstab on the cd)
    (working versions of these files are all included here)
  17. Create an etc floppy, or include the installer script and related files. installer.tgz
  18. Create the ISO image using the command in mkiso.sh (adjusting paths as appropriate)