The Cat

I want to reuse an old 10 gallon that previously housed a hamster for a gargoyle gecko, so I’m planning on setting it on its side. The lid doesn’t exactly fit the tank so I’m gonna need to work on it before I can use it. Anyone have any tips for “tightening” the lid to fit the tank? It’s only half an inch-1inch too big so hopefully its fixable. This may be a stretch, but is there anyway I can modify it to have an opening door or something so I don’t have to take the lid entirely off every time I need access to the inside of the tank? Sort of like those zilla tanks with the little hatch, I suppose. Thanks y’all