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I guess yes. Not sure what it looks like.Would you consider to make the transfer stage, together with the lander?
I think they will dock in LEO, or so. It has a large sunshield at the back, to reduce propellant boil-off of both vehicles.
I guess yes. Not sure what it looks like.

I guess the vessels are docked?Now this. I wonder how to transfer the fuel?
OBJHANDLE docked_ship = GetDockStatus(GetDockHandle(0)); VESSEL* v = oapiGetVesselInterface(docked_ship); fuel = v->GetPropellantMass(PROPELLANT_HANDLE ph); //get fuel mass of docked ship newfuel = fuel = 100; // add 100 to fuel; SetPropellantMass(PROPELLANT_HANDLE ph, newfuel); //new fuel PROPELLANT_HANDLE tank3 = PROPELLANT_HANDLE tank3 - 100;