Desktop reconfig

[Baho Utot]

I want to reconfigure my desktop.  I want to move it from 10.1 to 11, I 
am using 11-CURRENT now
I would like to move it to ZFS raidz1 (four drives).

Here is the current setup:
Win7 and freebsd 10.1 on the first hard drive ada0

$ mount
/dev/ada0s3a on / (ufs, local, noatime)
devfs on /dev (devfs, local, multilabel)
/dev/ada1p2 on /usr/home (ufs, local, noatime)
linprocfs on /compat/linux/proc (linprocfs, local)
/dev/ada1p3 on /tmp (ufs, local, noatime, soft-updates)
fdescfs on /dev/fd (fdescfs)

$ gpart show
=>       63  976773105  ada0  MBR  (466G)
          63       1985        - free -  (993K)
        2048     204800     1  ntfs  (100M)
      206848  614195200     2  ntfs  (293G)
   614402048         34        - free -  (17K)
   614402082  362371023     3  freebsd  [active]  (173G)
   976773105         63        - free -  (32K)

=>        0  362371023  ada0s3  BSD  (173G)
           0  314572800       1  freebsd-ufs  (150G)
   314572800   47798222       2  freebsd-swap  (23G)
   362371022          1          - free -  (512B)

=>        34  5860533101  ada1  GPT  (2.7T)
           34        2014        - free -  (1.0M)
         2048  1953122304     1  ms-basic-data  (931G)
   1953124352  1048576000     2  freebsd-ufs  (500G)
   3001700352     8388608     3  freebsd-ufs  (4.0G)
   3010088960  2850444175        - free -  (1.3T)

New setup will have freebsd on raidz with Win7 on the SSD only.

Can I install the four drives for the raidz, configure and install 
freebsd then remove ada1 when I have it all working?  or should I remove 
ada1 then install the raidz drives install then reinstall ada1 and the 
pull everything over?

Will the installer handle installing root to zfs raidz? or will I have 
to wing it?

Going for a clean install and synth to do the ports.