Hi! Oooh tihs is so cool thanks for playing with this idea with me! Here are some random thoughts, both related to your drawing and not:
-swamps tend to be really shallow, which is why we have the boatcars
-here's some native swamp plants people can eat: wood sorrel, thistle, red clover, mulberry
-maybe a two-tier public transit system? We have streetcars, it'd be a shame to give them up. maybe there's parts of the city that are flooded, with houseboats/amphibious vehicles/big parades (the floats could actually float in the water, and instead of tractors they could be pulled by cute little tugboats. and I think the tugboats should have a little paddlewheel like our riverboats, just for fun), and then parts that are not, with buildings on land/streetcars/walking parades on roads.
-I definitely think emergency vehicles should be amphibious vehicles!
-important buildings like a city hospital should be tall and we NEED to have helipads on the roof, both for lifting patients in and for evacuation. So a full rooftop garden wouldn't be a good idea, but I bet a groundcover plant could work for those roofs, maybe one that soaks up a lot of water? Smaller buildings probably want slanted roofs so water doesn't pool. Not sure how to solarpunk slanted roofs--we do alright with solarpanels but they do take a beating.
-LOVE the gondola in the air! With our heat, definitely would need GOOD window coverings to block out sun and heat. In general, New Orleans should have smaller and fewer windows than in classic in solarpunk--some of our new office buildings are like all-window, you know that new style? And it sucks in the summer
-NO STAGNANT WATER this is mosquito territory and I hate them both personally and because they're invasive. Gotta keep ALL WATER moving so they don't breed
-this is random but based on your drawing, I'm really seeing the main city as being like above the ground/water (also a great way to keep people from getting hit by streetcars or falling into the water, easy to have rails on that if pedestrian walkways are more elevated than not.). Thinking about the Highline in New York--if people are walking, I don't wanna put on train on it, but there's such cool plants and seating areas on stuff on that. And I always felt so safe walking on the Highline because it was removed from the cars on the street. I wonder about how we'd drain it during rain--maybe the whole thing could be on a very slght slant that humans don't notice but then all the water drips off into the canal below
People are making a lot of good points about boats, but on the other had, I know that indigenous people, poor communities, and communities outside main developed areas use boats a lot just fine! I wonder what the difference is--I was thinking about this earlier. Maybe, in a swamp city (not just water, but kinda salty water, which is even worse), we want to go all in one quick biodegradables--stuff that only lasts for a year or two but then is easily composted. Natural materials, and then digging out the canoes or whatever is a community activity! This wouldn't work for emergency vehicles, because they wouldn't be motored and wouldn't go that fast, but it would prevent big waves from like disrupting houseboats like someone said.
One of the ways that maybe the traditional biomes shown in solarpunk might not translate as well to my city: they really seem to want infrastructure that lasts near-forever, and I literally don't think that's possible here. We're just too storm-battered, too humid, too wet. I'd definitely wanna see what more people think about short-use biodegrades. I know solarpunk hates single-use and waste, but I think maybe this doesn't count if the materials compost well?
I hate cars and car-centric urbanism, so maybe this is a way to make sure the use of boats doesn't just become the way cars are in New Orleans today--a slower pace of life, you have to paddle the boat. More like bikes than cars that way/