A small note, the GT series turbo are physically narrower than the T3/T4's, probably by most of that amount. Great pic by the way!
Where does the BOV go on the RC IC? Or does it not have one? I highly recommend using a BOV for the life of the turbo.
On previous setups where the ST205 core was used, we didn't have the standard brackets, so either made our own, or didn't use any other than the hoses, and gravity with some padding under the core.