So, I built my own canopy for my 150 gallon tank a while ago but one thing I never added was any sort of support to hold the access lid open, which is a 6ft by 18" piece of plywood. Usually I just raise the lid and it sits upright resting on the top of the tank but a couple of times I have had it fall and hit me when I wasn't paying attention, which needless to say was not pleasant. If it ever fell when I wasn't there to catch it, it could potentially crack the tank, so I need to find a real solution rather than holding it up and hoping for the best.
I was wondering what you guys with similar setups use for a lid support to hold it up and maybe ease it down.

I was wondering what you guys with similar setups use for a lid support to hold it up and maybe ease it down.