your sample of application included a large request of function, which need to be define very clear before accurate deliverable and price can confirm
Nevertheless, I had developed a trading system , with script control engine, data engine and very fast response chart GUI/core system that is similar to your request. I would say the GUI section can be quote to you at the following bid.
additional function, such as bank API, fix/fast module, backtest module etc and future development can be discuss.