Are the images of the finished product or just the mock up? My appollogies for stepping on toes but for the price I would think a bit more effort would produce a much cleaner exhaust, unless of course you were just generating the mock up from the bits you had laying around.

Most likely I will end up building my own exhaust as I tend to be picky with build quality and would't be happy with all the extraneous splices and angled connections.

I am no expert but my I did have success making a custom turbo back 3" exhaust for my other ride. There are a few companies out there that will custom bend all the bits you need (not crush bent either) if you provide them measurements and its very reasonable price wise. The entire exhaust (non crossfire) turbo back was around $300. Obviously this setup would be a bit more if the dual pipe setup was used.
Below is the previous downpipe i created flange and all for under $75.00 flange included.