A few twitter artists I follow that do paper architecture:
https://twitter.com/TTI304?t=VGmdP3ZwDWTc1YEz0S-hYg&s=09
https://twitter.com/nekomata14_?t=VGmdP3ZwDWTc1YEz0S-hYg&s=09
https://twitter.com/Fe2AEiFqz0X9AYw?t=VGmdP3ZwDWTc1YEz0S-hYg&s=09

I'm envious of people who can just visualize and make things from scratch, I can think like that, I need a drawing program.

If you have money, Sankei has model kits that are a real experience to build. The engineering that goes into their kits is top notch

I actually draw houseplans as my job, I'm currently prototyping a model for a house that's currently under construction. I'm trying to emulate the style Sankei uses to design their models.