Here's the crap from JumpStart:

Begin script install_begin execution completed.

Processing profile
        - Selecting cluster (SUNWCXall)
        - Deselecting cluster (SUNWCpm)
WARNING: Unknown cluster ignored (SUNWCpmx)
        - Deselecting cluster (SUNWCdial)
WARNING: Unknown cluster ignored (SUNWCdialx)
        - Selecting geographic region (N_America)
WARNING: SUNWpmowr depends on SUNWpmr, which is not selected
WARNING: SUNWpmowu depends on SUNWpmr, which is not selected
WARNING: SUNWpmowu depends on SUNWpmu, which is not selected
        - Configuring boot device
        - Using disk (c3t21000004CF5B64FAd0) for "rootdisk"
        - Configuring swap (c3t21000004CF5B64FAd0s1)
        - Configuring /var (c3t21000004CF5B64FAd0s5)
        - Configuring  (c3t21000004CF5B64FAd0s7)
        - Configuring  (c3t21000011C63FAC50d0s7)

ERROR: (_app_set_slice) Disk is not selected 

Disk layout for selected disks

    Disk c3t21000004CF5B64FAd0
                             Solaris Slice Table
          Slice     Start  Cylinder         MB  Preserve  Directory                
        -------  --------  --------   --------  --------  ----------
              1         0      3455       8193        no  swap                     
              2         0     29523      70002        no  overlap                  
              5      3455      1728       4098        no  /var                     
              7      5183       108        257        no                           

          Usable space: 70002 MB (29523 cylinders)   Free space: 57457 MB

Verifying disk configuration
        - ERROR: Slice is less than one cylinder (c3t21000004CF5B64FAd0s0)

Verifying space allocation
        - ERROR: "/" does not fit on any disk


                                        Space Requirements (Mbytes)
        Directory                     Actual    Required     Default
        -------------------------  ----------  ----------  ----------
        /                                           4815        5604
        /var                            4098*         82          97
        swap                            8193           0         512

                            TOTAL                   4897        6213

        NOTE:     an '*' following actual sizes indicates an          
                  existing or explicit size was specified in          
                  the profile                                         

ERROR: System installation failed
Solaris installation program exited.


and part #2 --  what do I have to do to make e1000g0 bootable?

lrwxrwxrwx   1 root     root          42 Jul 24 22:33 /dev/e1000g0 -> ../devices
/pci@8,600000/ethernet@1:e1000g0

{0} ok devalias net
net                      /pci@8,700000/network@5,1:
{0} ok 

{0} ok show-devs
/pci@8,600000
/pci@8,700000
/memory-controller@1,400000
/SUNW,UltraSPARC-III@1,0
/memory-controller@0,400000
/SUNW,UltraSPARC-III@0,0
/virtual-memory
/memory@m0,0
/aliases
/options
/openprom
/chosen
/packages
/pci@8,600000/ethernet@1


When I do "boot /pci@8,600000/ethernet@1:" i get "Cannot open boot device."