Better Hard Surfaces.

Hard surface modelling with Booleans is a bad idea if you hope to have lightweight, controllable, easy to texture models which may need deformation, transparency, sub surface scattering and the ability to be understood by any other 3d and 2d software.

If you are messing around with normals to make your models look acceptable, You probably have bad geometry.

A better understanding of the inset tool and basic topology will get you much further!