Apple states that for disk space and Tiger, "At least 3 GB of available hard disk space; 4 GB of disk space including the Xcode 2 Tools."
It is also recommended that you keep 15% free disk space at all times, so for your 60 GB disk, that sounds like about 10 GB free at all times.
The latest version of Tiger is 10.4.11, which came after 10.4.10, which in turn came after 10.4.9. So you have the latest version.
(Not sure why you are asking about space needed to install Tiger and its updates since you seem to have already done that.)