A couple of years ago I wrote a guide for those who want to learn to build objects and train external views
Here's the link to it: https://docs.google.com/document/d/10YiyOGf4PI4PKKwXb_-BZwiY91ghxXV6zXv0bDKGlcg/edit?usp=sharing
Also includes how to texture an object. This is for basic building an object but the principles can be applied to build up more complicated structures.
Mad respect. Thank you so much, I am learning how to start making routes so this forum will come in handy.