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It's not viable because you're putting yourself hugely behind for 35 minutes when you don't even like anything it gives you other than Muramana. You could put yourself further behind for less time by rushing Manamune, but why bother? By forcing yourself to use rockets, you push the lane and your dueling is much weaker, making you more vulnerable to an all-in than if you kept those minigun stacks.
I had the miserable experience of laning with a Jinx who bought one and had it 1/3 charged by the time laning ended. She eventually got Manamune and it still hadn't transformed by the time the game ended.
"That is why war is so tragic. To win means to make victims of your opponents and give birth to hatred." - Kratos Aurion, Tales of Symphonia