morning snkbte,
Your idea is good but it wont pass engineering in NSW at least.
You simply have to run under car system for engineering/blue slip.
You also have to do a pretty good job to pass the noise test.You will also end up with ground clearance problems( lowest part 100mm off ground) . Leeroy did a top job with his and there are photos in his gallery.
I used Ians rego set and only just got through the noise test after making on the day mods.
There are two tests , a drive by , passed easily . and a stationary one , much harder to pass.
The tests involves holding the engine revs at 2700 rpm with the noise test being taken 500mm from the exhaust tip.The level must not exceed 90dB. I got 89.
Good to see your motor arrived. Just get the right mounts and you almost home
Phil