Chris a grab bucket dredge would be ok to build with a single crane and twin chain grab bucket and dredge hopper doors that open to release the dredging spoilings sand etc the only problem is the suction of the sand/ mud this is what causes the dredge to rock in roll the suction being a ex dredge crew I have seen a couple of these in r/c 1/48 and 1/24 scale would be a great fun model to work the old girl i worked on was a single screw grab dredge built 1948 have work trailing cutter suction,bucket endless chain of buckets,grab dredge,and the suction barge type dredgers.good project to build in r/c tassie48.