The Challenge of Isometric Drawing: Drawing a Pagoda Using Shapes and Curves

This is my drawing of a pagoda of my own imagination. I used Affinity Designer since it makes isometric drawings (using shapes) easier than Affinity Photo (which I use by default). As I was drawing this pagoda, I started to draw from the top going to the bottom. However, it can be challenging to do so, requiring grouped objects to be arranged more often than not.

My big question for myself (and others) is, "Would it be better to start drawing from below?" It could be a challenge but will it make my work easier in the long run? I drew the pagoda from the upward direction. What if I drew a pagoda from the downward direction upwards? 

Now, I tried to draw everything from bottom to top, but not everything was drawn that way. Drawing things from below can be helpful, like putting scaffolding and temporary guidelines in a drawing. However, it's not easy, and a lot of trial and error was done with this second pagoda that I drew using shapes and curves. You can tell that I duplicated some areas (from an AFDESIGN file) and did some palette swapping to the pagoda spires. I decided to use some gradients to give a "better touch". 

Each pagoda was drawn at two different times. The first pagoda was used as a lesson to attempt another pagoda.