The OP is taking 2 amazing engines (2JZGTEs) and combining them to into a unique, and amazing TT setup. That alone is pretty awesome and will create something even better when done. The reward here is having something unique, powerful and customized when complete. Plus a whole lot of fun along the way.
Had an automotive friend who decided that he wanted to make a spark plug. After two years he finally had a prototype. It popped apart after about 10 minutes of being installed.
Homemade brewing cannot compare to the engineers at the various manufacturing plants with millions of dollars of equipment, research, computer software, etc. In these pictures, I don't even see a tool box, lift, dyno, or anything that a real designing shop should have. In todays world, vehicle knowledge doesn't come from trying to combine two amazing engines, it comes by combining the knowledge of the best engineers and designers which can only be found at the manufacturing or racing level.