Don't believe everyone who tell you what it possible. It's 99% scammer. For this work need big rework engine.dll and nwindow.dll. About new changes inside interface i don't think what need talk about. It's oblivious, need to change few *.u script classes.
If someone ready for this work, then it will cost from 500 euro and above.
The cheap solution - get CT1 client, crop interface, crop map and upgrade packets. For client side edition exists all tools, for server side get java knowledge. No money, only a time.