Good work dude. Great to see a clean 240 in Canada!
BTW, where that gasket failed is normal. Not from the exhaust swinging around so much as vibration in the turbine... Metal gaskets alone will not fix the issue- You need to add OEM Nissan locking plates to your list to keep the nuts from backing out and it will never do that again:
Nissan Genuine OEM T25 T28 Turbo Turbine Locking Tab
You need 2 (one for each side) & they look like this installed:
Keep up the good work dude- it's an awesome learning experience~