If you're serious about commissioning somebody to write you a terrain engine, you should:
write a much more verbose/"better" specification saying what you want, exactly ... "write terrain" is a little ambiguous
put a post in the job-offers forum
maybe offer a way of proving that a payment could/would be made to the provider
On the other hand, I gave a link to a terrain paper in the "Assembler" thread, if you want to give that a looking over:
.. but to implement that "properly" is going to take assembly language and skills you *probably* don't know yet (maths, mainly).
I believe that Phantom published a terrain engine demo a while back, but I'm sure he'll get back to you on that one

Cheers, good luck,
Refractor.