Alternative for screen top?

I just set up my 2nd viv. The 1st one was the Zilla sliding locking screen top so I had to use the screen top, I just used tin foil. This 2nd one I bought a 20g long aquarium so I'd like to find another top option instead of the annoying separate screen top with side locks. Anyone have any ideas on how I could make some type of lid? Easy please because I'm no welder lol

Plexiglass, drill some holes in for ventilation, with mirror fasteners to hold it down (you can swing them out of the way to lift the top).

Don't bother with a heat lamp, use 1 UTH for a hot spot, put a second one on the other side set to around 82*F if the cool side ambient is too low.