Building Help - Creating inward angles

[jedisquidward]

I am creating a model based on this image, but I'm having a lot of trouble coming up with how I can tackle angles like these.

https://imgur.com/a/fhZk6Pm

Most of the building I have done is of actual buildings, so I don't have very much experience with angles. Are there some MOCs or sets you would recommend I study to achieve this effect? I want to see the guts of how these would work.

[howitzer]

Ideally, you should do the math to make sure you can fit your construct in grid, so that there's no stressed/weak connections. It would probably include a lot of compromising in specific angles and Pythagoras is your friend here. As for actual connections, you can use various hinge parts and maybe Technic bricks and pins to make the connections. You should also know whether you want to build it upwards by stacking bricks or maybe use large plates angled to your desired positions. Starting with simpler build or only a part of the final build might also be a good idea.

Somewhere in this forum there was a topic about roofing techniques, and there were a lot of angled constructions so you might want to search for that.