Offline PDF Voice GPT Assistant

I need a standalone Windows application that bundles a local GPT-style language model with a voice layer powered by Google Assistant. The workflow is simple: I open any PDF, the model ingests it locally, and then—through voice alone—I can ask questions about the document and get spoken answers back... (Budget: ₹600 - ₹1500 INR, Jobs: Machine Learning (ML), Natural Language Processing, Python, Speech Recognition, Speech Synthesis, User Interface / IA, Voice Assistance Devices, Voice Synthesis)