door/hood and trunk hinges

a quick google search found plenty of references

this is the most common type

http://www.briansmodelcars.com/tutorials/tutorial/49

here's a few other styles

http://www.briansmodelcars.com/tutorials/tutorial.asp?TutorialID=1&CurPage=1

http://www.briansmodelcars.com/tutorials/tutorial/76

An alternative to a working hinge is one that allows you to position hood in two positions- opened and closed. I find those easier to make than an actual working one in 1:25 or 1:24.  Working hinges aren't bad in large scale but I find it daunting in the normal scale.

To explain more fully what I mean; the hood can be closed- set in place normally, but there are prongs that fit in holes to hold it in an open position.

Thanks guy's, sorry not to get back earlier. I shall try and make a test set first and try on flat plastic card before perfecting. Thanks.