I was hoping to avoid mods altogether, not just big ones. But thanks, I'll think about it.
Didn't want to use engines, as even the lightest LF tank available to me, with engine, is heavier than RCS system (thrusters + monopropellant tanks). Also, RCS thrusters can be mounted on the sides and don't produce heat, which is crucial when hovering over a building.
I use a special ship to land things on the Mun, detach them and go back to Kerbin (hence the docking port on the building). Compared to a drone, it's rather large, so I managed to place two engines pointing at about 45 degrees instead of directly down, so the attachments don't get heated. With a drone, I'm afraid, that would not be possible.