Many thanks to everyone who responded to my post. After deleting all of the packages and adding them in order, including the 64 bit device drivers, for the fifth or sixth time, I finally did a boot -r and all the devices were built correctly. Not sure why this didn't work on previous tries - perhaps something I changed in the course of troubleshooting allowed it to work properly this morning.
Then I followed the tutorial at www.kempston.net/solaris/connectanyisp and here I am writing my SUMMARY to the list via my new PPP connection from my Ultra 5.
Thanks again to all who took the time to help me out.
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