Cross-Platform Multi-Wealth Manager Development

MultiWealth Tracker Project
A Unified Financial Management Platform

Project Overview
Project Name: MultiWealth Tracker
Project Type: Software Development macOS and Windows (Open Source, Cross-Platform)
Objective: Develop a comprehensive financial management platform integrating features from Money Manager EX and Micro Real Estate, alongside additional business functionalities inspired by QuickBooks and Tally
Key Priorities: UI/UX

Project Scope
The project involves developing a cross-platform financial management application with a seamless user experience and robust functionality. Features are categorized as follows:
A Lot of them are from: https://moneymanagerex.org/, https://github.com/microrealestate/microrealestate, https://kmymoney.org/, tally, quickbooks , what i would like is to have all of those into one while keeping in mind the requirements below. This should make creating this project easy as you have 80% of it available as those are open source code.
Since this is a multi purpose software the design and layout needs to be perfect to make using it easy and not a headache. The ui is the most important for me and design. Beforehand i expect you to discuss with me the project, show me samples gui specifically for this project caliber, and a brief summary of how this will be implemented.