All of the DG tier items that drop can be crafted. For the stat optimizer, make friends with the various top end crafters on your server and get the mods and enhs you want crafted for you. Yes, there aren't any Sturdiness or Immunity Enhs (much to my chagrin), but that's just something you have to deal with, especially since there weren't any for the Campaign tier either (and for the Rakata tier you had to either get *really* lucky with a schema drop or pick them up from HM/NiM chests as explicit enhancements).
Unfortunately, nobody on my server seems to be able to craft any tank mod/enh for the moment. Plenty of dps stuff, but nuthin' for the meat shields