This is a great option. 5-6 of these MPAs would help a lot, specially if it comes with ToT (maintenance, overhaul, licenced assembly or part manufacture). Then there's the civilian demand for flights locally.
Yes we have a lot to learn from how China has so rapidly developed. But more importantly how they created a long term vision. Again thanks to China for all their help.
That's the key, if we can move the bulk of the factories out of Dhaka to specific areas like the SEZ's then you'll see major changes. Just look at the Tejgaon Industrial Area next to Gulshan and Hatirzil its ripe for redevelopment (big factories with large plots of land).
Your right, the lack of a deep sea port increases the transportation/shipping costs by over 45%. With the rapid increase in exports and trade, its become essential we build a efficient large deep sea port directly connected to a rail network.