Depending on how you interpret the rules, it's of a size that allows you to basically do whatever you want provided you don't foul some of the add on requirements that Hamilton has.
But, the one thing I'd suggest is looking at everything you have with a good stink eye for the permanence of it - meaning putting in a lot of effort only to find out that something core to the setup isn't as good as expected and falls over at the first hurdle. Having been down this track a couple of times, its a pain in the arse when you discover that what looked good and solid isn't and requires a major rework and reverse engineering session to sort it out. Frustrating and can be expensive and blow out your budget when it could be simpler and easier to remove and replace structural stuff completely at the start under a 'like for like' excuse I mean work scope and allow for future use changes or even expanding the carport's footprint at a later date...
As far as materials, good question well asked as I've done the similar thing with a few building projects around my place - saved multiple thousands of $$$ at the expense of time and labour costs to make what was cheap work. Sometimes it can work very well and if you can pick up suitable second hand (or even better new but rejected for some reason parts - roller doors are a good one here, got one for $500 been installed into a new build but was wrong colour so replaced after a few days) and adjust your build plans to fit the sizing of what you got cheap the old story 'how would they know' really does apply!
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