Help with triple piston extender on a cave door

I want a triple piston extender for the final block retraction on my cave door but I’m a bit tight on space. The double extender already powers one of the pistons as is so I’m guessing I have to incorporate the triple extender with the double. No idea how I’m supposed to do it though. It would be nice to have it push a redstone lamp that gets powered in the closing position but I think that is aiming a bit high. Any ideas?

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