> I let it start and after awhile I get an error message "the disk is full"
> It seems that it's trying to put everything on the root 
> partition, it gets filled up and stops unpacking.

 Small flaw in the installing tool. It does not mention that you are
required to add the "/usr/" partition yourself. At one point you are
asked whether you want to add other partitions to /etc/fstab. Answer
"yes" and add a line similar to this one:

/dev/sd0d	/usr	ffs	rw	1	2

 Note that /dev/sd0d might differ for you.

 Please start from sratch, as your "root" partition is filled up with
junk.

-- 
Markus Illenseer