My weight budget is 10 grams Id say. I figure a gram or two for the battery, 2 grams for the circuit board, and 2 grams for the servo. Thats 5 grams and I think those weights are ok because Ive seen timers that light and lighter. After some thinking, I've drastically simplified this thing. Instead of 3 buttons I will use a 10k trim pot to set the time and a button to stop and start the timer. My friend wants me to add an led for low voltage warning as it will be powered by a 1 cell lipo battery and they cant be discharged below 3 volts. In model airplane competitions the flight time increases from 2 minutes to 6 minutes in 30 second increments. I have 180 degrees of travel to work with so every 30 degrees equals a minute delay. 60 degrees= 2minutes. Simple.