Don't know if it has been proposed for 50 times, but I think a mech suit can be quite handy for mass collection/construction/combat. I was watching Aliens 1986 and I thought: hey this is cool, if only I could have something like this in the game. And also paying respect to those classic sci-fi concepts.
There are already mechs also one of the pictures look very much like the human mech thats already in the game
I'd like the building exoskeleton, with the ability to dig and build quickly and at a great distance.
have you tried out http://community.playstarbound.com/resources/xs-mechs-vehicle-edition.3407/ ? maybe it's not exactly what you're looking for, but it looks close and is pretty neato. http://community.playstarbound.com/resources/digger-turret.1575/ has a digger mech tech (i'd like him to convert it to a vehicle, but shrug. it works) you can use to dig, at least. it can't build, but it can dig. http://community.playstarbound.com/resources/skizots-dozers.3094/ same deal. digs, but can't build. is a vehicle so doesn't waste tech slots, but only works horizontally or in gentle grades up and down.