Hi there Oxygen5,
just thought I would add my piece.
If you have a second computer running Linux/solaris, it would be possible to perform a network install by doing a "Jumpstart".
I have seen it done and there are a few documents turned up when I did a net search for "linux solaris jumpstart".
Sorry I cannot help with the specifics, but I thought you might like to know what is possible.
AND you can do all of this without needing a floppy or cd drive in the SPARC.
Instructions for doing this with two solaris machines
are here.