I find Wraithlike's beginning polygon-laying methods to be quite good for this kind of stuff.
You just make a series of triangular polygons like this: /\/\/\/\, copy the whole thing, and flip it over and attach it underneath and then copypaste until you have the general layout you intended for, then start shaping them.
I know this may seem time-consuming, but it does reduce the amount of unneccesary polygons you need, and you don't have to create any more polygons except for cosmetic and debugging needs.