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Very nice setup you have there. I also fabricated my own rear mount turbo setup as well, the way I went about solving the (parked, engine off) oil issue was to have a turbo timer and set it for about 1 to 2 minutes, then wire it up to the relay that powers the scavenge pump, this way when you turn off the car, the pump will drain out all the oil thats sitting in the line, that way no oil will leak back to the turbo and passed the seals over night.
Good to hear that I'm not the only one that had this issue (not that I am glad you did). I thought about the turbo timer as well, but thought this would be much simpler and there is nothing that could possibly go wrong. The turbo timer and relay is a very reliable method, I just chose the other route, and it was free.