Is it worth making for tanking purposes?
If you plan on playing RUN seriously, you can afford investing in a good DT-% set - while leaving weapon slot for something better than a PDT GS.
This way you can toogle between turtle-mode and full-out DD at will.
Hybrid PDT set isn't a bad idea either, although I wouldn't used PDT GS for this build either if you got access to a GS with better DPS.
Something like this would cap you out on PDT w/o weapon assuming 5% and 6% augments on rings, and PDT-2% on each earring.
ItemSet 296420