Well, for the school stuff...
This is me (I didn't even know about this picture!) racing the old car. It's a loaner, designed as proof that a car can be made with no welds. The only design our team did was the front forks.
I blew the motor halfway through that race.
And this is the new, non-loaner car. That is not me driving, but the design of this car is about 75% mine. The front wheels are supposed
to have a camber to them, but the current build leader doesn't understand the importance of adjustable camber--or any at all, really--on the steering system.
My largest contributions were in making the car shorter (around 6'2", opposed to the loaner's 9'7"), with a wheelbase just as wide and literally almost half as long. The new design is less than a third the weight, not counting the batteries and driver.
A single person can maneuver this in and out of the elevator to out build room, including propping it up.
I don't often have pictures of my machining work, because it's usually replacements for broken parts or improvements.
Such as this. On the left is the pressure regulator from a paintball marker called an Automag. It's almost solid stainless steel, and weighs maybe three-quarters of a pound on its own. On the right is the replacement cap of my own design, made of aluminum. The postal scale says it weighs 1.2 ounces, and that's including a padded envelope.
You still need a regulator, but most players add one in place of a foregrip anyway. The stock one is an excellent regulator but is redundant at that point.
So, using one of my caps saves half a pound of weight and 1.25 inches of length--important for the 'front' players, who need to move quick and often prefer the smallest markers possible.
Alright, soapbox time is finished!