i did revised your FE based on number of customers from sales (enclosed file).
Assumptions are
1. Add 1 FE every 30 new customers
2. Add 1 FE supervisor on every 5 FE
3. Add 1 project assistant manager in 2017
Please check if you want to add anything else.
From this new staffs, please re-plan your training + tools + notebook + ????
Try to use formula because sales may change their targets (so we don’t have to change much).