POST MBA goal, realistic?

Yes, I mean, the main shift would be the post-MBA goal; strat consulting is generic but it's a viable path and it's good you have a defined practice area that makes sense. Might be even better to figure out which office has infrastructure projects that best align with your work background (like water/bridge/structural blah blah) just to show you have researched this (and of course - try to network with McKinsians for first hand perspective on discussing your goals/plans. this will impress adcom; always better to have quotes from them)

The "climbing the ranks" idea is viable of course but unlikely if you ever want to have a marriage that lasts or a life outside work. I like to see long term goals that are more socially focused or have some dimension that shows you contributions are beyond your own career. But if it isn't organic to your profile, better not to force it.