Can't build bootable install dvd on 5.0

[piminx%comcast.net@localhost]

Running this on NetBSD 5.0, 

I have repopulated the src tree and built a kernel and distribution, release, 
iso-image and iso-image-source. 

I want to build a bootable install dvd. I've tried what follows: 


[su]: mkisofs -o /tmp/output.iso -b 
./obj/releasedir/i386/installation/floppy/boot-big.fs \ 
-c boot.catalog -l -J -R -allow-leading-dots ./obj/releasedir/iso/i386cd.iso 

Warning: creating filesystem that does not conform to ISO-9660. 
mkisofs: Uh oh, I cant find the boot image 
'./obj/releasedir/i386/installation/floppy/boot-big.fs 
' ! 

[su]: ls -l ./obj/releasedir/i386/installation/floppy/boot-big.fs 
-r--r--r-- 1 root wheel 3686400 Aug 23 02:02 
./obj/releasedir/i386/installation/floppy/boot-bi 
g.fs 

[su]: ls -l /tmp/output.iso 
-rw-r----- 1 root wheel 34816 Aug 23 07:55 /tmp/output.iso 

Clearly, I'm lost. Help! 

TIA, 
Paul