I'd have to agree with Weston, the cool factor of a YFZ Warrior hybrid is off the charts but not cheap or simple unless you could find a totally trashed YFZ with a running engine & good electrical. Honestly, I'd love to doit b/c I just like that kind of stuff.
For the 446, it'll be cool & make good power, just not the kind of power that a 450 Will make, especially a Modded 450.
A Banshee engine would be cool but I doubt very easy to do, so many people forget one of the most important parts of a smoker....it's exhaust, it's critical, period. A Warrior chassis was never designed to fit the size exhaust that a smoker needs to perform properly, much less twin pipes, Lol! Can it be done? Yes. Will it likely look like a hackjob mess? Prolly, atleast unless you're a very talented fabricator.
Don't forget cooling it,..... Clearance for the kick starter, etc, etc. A Warrior is & always Will be a trail bike man, they can be Modded to do lots of stuff but it's a trail machine @ heart & that's what it's design was based around.