Obstruction and ship building

[Spaceboi]

I'm very amateur at shipbuilding so maybe I'm missing something... but things are being obstructed and I don't know why. They either flash in and out of red or are solid red even though the arrows are not covered. I'm starting to understand that is a radius and anything behind it is going to obstruct it for x amount of voxels. Could we just get outlines of the areas of obstruction or are there some rules to go by? It's getting more frustrating than fun to figure out where I can place things unobstructed.

[vylqun]

general rule is that you can't place anything behind engines/wings (or rather in the direction the force arrows show). Anything that isn't obstructed even tho something is behind it can be regarded as bug.