Yep right here...though not sure if this addon would still work on O2016Do we have the HL20?
Most of the renders of Freedom up to the 1991 concept show two docking ports (PMAs) for the Space Shuttle up frontAre there 2 docks? Not sure what should go inside the black ring? I have seen square hatches?
Looks like the large circular ports on this render depict the early design concepts for the common berthing mechanism used by the USOS modules of the ISS. This makes sense since those have larger doors and more permanent attachments for the modules themselves to useI like this. besides the APAS-75 dock.
CBM. What model likely depicts is an early iteration of what would later become the Common Berthing Mechanism. So the hatch would not be round but square with rounded edges. At this point nothing was finalized, in fact SSF only ever existed "on paper" so to say with no actual hardware built. "Dual Keel" was just one of many design concepts of SSF with another notable one being the "Power Tower". Eventually both got paired down to what ISS is today with pre-fabbed trusses and a single row of pressurized modules due to budget cuts. Also, the two propulsion trusses (P2/S2) were deleted with the RS taking over that duty.Confused.
So on the ends of the nodes. this is what should be there? It looks like the petals fold inside rather than the outside like the photo. Hatch texture like this.
for the International Space Station "Alpha" it was planned to create large crewed vertical-takeoff, vertical-landingThe real name of the "International Space Station" is "Project Mir-Alpha"
for the "Freedom" Space Station it was planned to use the HL-20 Personnel Launch System