Yes that looks tasty. I like the collinear aspect, it should lower your effective angle of radiation.

The mast yo uput it on will need to be very tough and stable (and therefore guyed) - that long it will have a lot of windage whatever teh blurb says.

Unless the mast is at least 6 feet above your metal carport roof before the antenna starts you will have a murderous swr and directionality problem. I recommend trying bolting a 9 foot whip through the middle of your carport roof as a starter. If it works, brace the roof very well and then try a 5/8 wave or a collinear in stead - also through the middle of the roof.

DO get the ham aerial handbook as recommended above.