Nice start. But in my humble opinion you need to loose the chainsaw thing from the front. More rivets on the white plasticard bits (i do my Ork ones with cut of discs of plastic rod). And i always thought a lifta/droppa was a tractor beam type weapon, so i think a big battery and lots of cables/wires and maybe some type of over sized fuses or relays or other type of electrical gubbins.
It looks good, just needs more detail i guess is what i am saying. With Ork weapons and vehicles the basic shapes are always simple and boxy but the detail is where they come to life.