The bottom two rows are actually like that in the reference. The upper row I made higher though but only cuz I thought it looked a little odd lower down. I also made a few changes from the reference for the purpose of speeding up the modeling. I have alot to model in a short amount of time so trying to cut corners where I can. I'll go ahead and post the reference I used for this last one.
Don't be satisfied with what you can do but rather strive to do the things you can't do!
Exceed Expectations!