Projected feasibility: 8/10
Impact: Lightbulbs on the sides board could show how far the bullet
Detailed description: Row of lightbulbs at the corners of map table (or maybe under the map, if table is glass or see through) would light up after shooting the cannons of Nest, showing estimate on how far the bullet has flown during the time you see from the stopwatch.
Extra information:
lightbulbs could be on a steel or wood base, and sequentially light up per second, showing how far the bullet has flown on the map before hitting the ground
Conditions: Lights would activate after shooting and show how far the bullet had flown until nest reload
Rarity: After each shot fired from main cannons
Effect: Eases the way to see how far off it was in certain lenght, before taking into account the angle where Nest shot