Mythbusters showed I could just wrap this bad boy in duct tape and be good to go.

Homebuilt aircraft are a huge thing. Check out barnstormers.com

Right? How about a couple thousand of them all gathered together:

https://youtube.com/shorts/k29taoZX1Rc

Man if I was a millionaire bet I would have my flying licence

You don't have to be a millionaire to get a light sport license, and you can fly some awesome, inexpensive aircraft with it. My personal fantasy "amateur built" aircraft is the Lancair Evolution. The company provides a mandatory "build assist" program where you work with their people at their place to build it, and it rocks a Prat & Whitney PT6 turboprop engine. It's a 4 seater with a pressurized cabin and flies at near-jet speeds with decent fuel efficiency. They go for around $1.3M though, which is a bit out of my budget at the moment. :(

Yeah, but I still hear it costs a crazy amount just to fly, what with fuel and all, I'm paycheck to paycheck so it's kind of just a dream for me

Yes, like boats, vintage cars, etc., it can be an expensive hobby.

I'll sadly stick with my aquarium for now, one day though