I gave up on trying to figure out SEA. I am not a C programmer.
I found a free product called net-snmp at http://net-snmp.sourceforge.net/
This free product is similar to SEA in that it allows you to create custom subagents. However, and this is a big HOWEVER, this install allows you to monitor virtually any resource on a Sun host after performing a basic install.
The default mib that comes with net-snmp allows you to monitor things like processes, mem utilization, file system free space, log file sizes and cpu utilization etc.
I did no programing whatsoever. Took me about two hours from the time I downloaded the software to the time I was polling my host with HP Openview.
I hope this helps someone else looking for a free SNMP agent to poll host resources.