Does anyone know who Daniel Biringer was? He produced a number of blueprints which are on the Cygnus-X1 site- the Greynet-class Police Cruiser, the Whilwind-class Troop Transport, an Automated Bulk Freighter, the S-4000 Mobile Starship Dock and the Voltara-class Supply Ship. The last one is a favourite of mine, though I ditch the "experimental magnetic engines" for a pair of impulse drives and a couple of upper level warp nacelles. I use it as a sort of Federation Free Trader, mass produced and widely customised, Star Trek's Corellian YT-1300. It nicely fits in with the blocky rectangular aesthetic of the TOS era Independence-class Freighter and Sherman-class Cargo Drone. I have the blueprints for the Voltara and the Bulk Freighter and always have an eye out for the others. Starlog Magazine #10, from December 1977 has an advert that lists most of those mentioned here but also a sixth, a Tractor Tug. This is mentioned in the text for the Mobile Starship Dock but it's not on Cygnus-X1 and I've not been able to find any other mention of it. So, does anyone out there have this and is willing to give us a look at it and also does anyone know the whereabouts of Daniel Biringer?