Is it a daily driver, and/or do you need it sorted asap?
Its easily done replacing the engine and turbo, and both can be had very cheaply from a breaker. At the end of the day, its all just nuts and bolts, so with the right tools, it could be done pretty quickly. I know you'll have no knowledge of the replacement engine, but its a risk I suppose may be worth taking.
Lots have replaced engines due to failure, me included, on cars that aren't worth much at all. If you can do without the car for a little while, I'd be happy to guide you through the replacement.
