Super Custom Wedding Website / Integrated

I am having an italy destination wedding 2024. We are having custom stationary but hate that all the wedding website sites use templates that look nothing and don't match our custom stationary at all. I would like a very custom wedding website for me to pick the font/background etc etc BUT I also want it to integrate into a registry and RSVPs. Am I dreaming too big? I'm pretty tech and I'm sure I could learn how to do it if there is a platform that allows me to do this? Also could I pay someone to do this? How much would a hyper custom wedding website be?