The mod doesn't display anything about actual ships right now, it only shows the stuff from definitions.

It can show the mass of a ship but I don't see the reason because you already have that information when you're controlling it or in the control panel's Info tab.

What about grids without consoles? As someone who likes to mess with pistons and rotors for me it would be very nice to have something that can give me the weight of a subgrid without having to attach a console and then subtract it's weight.

That being said I don't know if this information is valuable enough to always occupy a line whenever you are holding a block.