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Hello,

>> 1/ Will NetBSD work for the Ultra 10 sparc?

Yes.

>> 2/ It is complicated/possible to change out the hard disk
>> [put in something with larger capacity], and have NetBSD
>> easily accommodate/format it?

Not at all complicated, internal disks are likely ordinary IDE disks. 
You might want to use a SCSI controller though since the onboard IDE 
chip doesn't support any UDMA mode, only PIO4. The firmware supports a 
few SymBIOS chips directly ( so it's bootable even with incompatible or 
no ROM on the card ), like the 53C875 UW-SCSI controller which is 
fairly easy to find ( should be pretty cheap as well ).

have fun
Michael
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