Might help save space, keep the exhaust further away from sensitive areas...What about a set of these standing vertical in your diffuser in the same location your exhaust currently exits just put these vertical to the outside of each box of the difuser
I know there are some more, might be able to get it in canada via your favorite parts store, maybe lordco if the parts guy will look into it for you
You can also get round to oval adapters which would work good off of the headers. I originally seen this stuff used in nascar and have always wanted to do an oval exhaust system but never really had the chance
Hopefully that search term and website gives you a start...
I am currious as to whether or not you have pictures that you plan to post, that show your exhaust tip with the rear clam shell mounted onto the car.
That is very nice work, and I'd really love to see how it worked out for you. If you're saving that for an "all-in-one" reveal, I get it. Sure would be nice though.