Can you identify this one?
It's part of a series of models I had as a kid that I want to take apart for my own kids now, and I'm looking for the original instructions.
Looks like it is this Universal Set with Flex System. Looks like the instructions can be had fairly cheaply.
Don't pay for instructions until you check this site: http://lego.brickinstructions.com
They have a lot of PDF files of instructions listed for free.