I've spent some time looking at the intake. The real problem is the real estate taken up by the IP. I wondered about a full custom intake too. The heads are symmetrical.
No reason you couldn't do custom injector lines. As long as they are all the same length, the shape shouldn't matter if you can make the correct flares.
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i dont believe length would matter, as fuel is not compressable, it acts as a "solid", similar to brake fluid. Length doesnt matter, you still get the same volume into your medium at the end of the line