No need to remove cladding ~ frame is open at end ~ use wire to pull bolts through holes ~ just run wire through hole and out frame, attach bolt to wire (duct tape!), pull back through hole. They give you carriage bolts if I recall so don't need an impact wrench ~ hand crank will do ~ no probs with spinning. Loctite is your friend. Took me about 45 minutes ~ 15 minutes of removing brackets, fishing, torquing bolts ~ and 30 minutes to drill four holes! Hope you have a sharp drill bit ~ that frame is stout!