The tool drawer is for allen keys, lubricant, side cutters, and other miscellaneous tools. The blower fans will help cool prints evenly from two sides as well as lower fan speeds to make the machine quieter. My first thought from engineering classes was aerodynamics might be a problem but the reality is that 3D printers do not even move 1 mile per hour at their full acceleration and are barely affected by any drag.
Overall a great way to make the machine stand out from all the other printers with a unique and functional look. Surprise surprise, I budgeted for this ahead of time and ordered double the number of fans than were really needed. I am happy I am ahead of schedule to include this in the final design and I will be polishing it more tomorrow.