Whilst not acheiving the speeds of the SRB-powered watercraft, I would nevertheless like to submit a practical high-speed craft for everyday use: The Waterbourne: For the speed freaks, Mk II: /Ed
Could you not forego the extra upper girders by angling the refuelling girders up slightly? You'd need a corresponding angle down on the docking port too, of course. That saves you three parts. -- Ed