I have to tell you, I would change the hood idea, or make it open in reverse. To make it do this is a tall request. If you made some sort of slide, what would hold it while the hood is open? What would happen if it slid back while the hood was open?
Just make it open in reverse and make some sort of quick release so you can take the hood off easy when you need to work on the front of the motor. You could do this in a way where the hood goes back without any adjustment. So you would quickly pull it off and on. Make a piece on the hinge that adjusts, then the hood bolts straight to it. Or of course make all the adjustment in the hinge to the rad support or where ever you mount them.
I am thinking that is your best bet. Not that it can't be done somehow understand, not that you can't figure out a way to do it, my point is, I don't think it's the best way to handle it.