Hi Lee.
Tools? Well ... some cutters with blades of different shapes, sandpaper, abrasive files ... really don't remember using nothing more.
If you make a good prior planning and prepare a template guide, the rest is only cut and paste.
For example, the "dripping gutters": I used 0.25 mm styrene sheet to build a rectangular tube. To make sure the tube was uniform and has the correct size, first I cut a solid strip with the tube inner measurements. I used the strip as master to stick the four walls of the tube around it. When cutting the small dripping gutters, I did the cuts with the strip inside the tube, cutting at the same time the tube and the inside strip to prevent the tube walls collapse when cutting in such thin sections.
Want a more complicated example?
These two pieces are part of my Snowspeeder model.
22 bits of styrene glued together
in each of these parts.
View attachment 586540
Fully improved Snowspeeder: Rogue Leader
As I said before, planning, printed template, cut and paste. Easy. :angel
Thanks for your kind words.
Rafa