How much does it cost to build a helicopter engine?

It varies, mostly depending on land acquisitions through eminent domain, because in the United States, the constitution requires just compensation for all land taken through eminent domain. Things...

I believe a fuel celled car costs relatively comparable to nearly a whopping 800,000 dollars so the cost to build a hybrid vehicle is highly probable to be somewhat around 60 to 200 thousand dollars.

its a couple thousand dollars

To many variables to answer with any sort of accuracy, but around and between $150.00 to 275.00 per square foot.

It can cost from $1000 to $500,000 depending on the size and material