Ninjatrader Delta Volume Bar Script

I want a custom NinjaScript 8 study that builds a true delta-volume bar view, not just cumulative delta. The core logic has to calculate bid-ask volume in real time, aggregate it into bars based on delta size, and repaint nothing after the tick is closed... (Budget: €12 - €18 EUR, Jobs: C Programming, C++ Programming, Data Visualization, Financial Analysis, Market Analysis, Metatrader, NinjaTrader, Software Architecture)