I'll take an educated guess about the nose guns ...The early B-17F's were delivered without any nose armament, this includes the cheek guns and were either modified with the addtion of cheeks guns in the US or in England before the airplane was issued to a combat unit.
I've seen at least 7 different set ups for the guns mounted in the plexiglass nose ... 1.) no guns at all ... 2.) a single offset .30 cal. ... 3.) a single .50 cal. and a single .30 cal. both offset ... 4.) a single .50 .cal offset ... 5.) a single .50 cal. mounted in the upper center of the plexiglass ... 6.) 2 single .50.cals off set either side of the center .. 7.) A twin mount of .50 cals. mounted on the center line.
The two pictures mentioned here don't show any guns mounted in the nose piece. The one close up seems to show the dimples molded into the plexiglass for mounting the guns as time permitted. It's possible this aircraft may not have had any nose guns installed given how early in the bombing campaign it was lost. But that's just my opinion.
The 2 antenna wires you asking about may have been 3 wires. The references I have show 3 as installed at the factory. The command radio antenna runs from about 3/4's up the fin, to the radio mast then down to the antenna lead-in on the right side of the radio compartment, just above the the leading edge of the window.
The other 2 antennas were liason radio antennas. One ran from a lead-in aft of the radio room window on the left side to a mount on the left wing, forward of the aft spar. If you're using the Monogram "G" both of these are on the kit. The other liasion antenna runs from a lead-in located ahead of the left waist opening and running out to a point on the left wing above the flap aft of number one engine. I don't know the reason why they needed 2 liason antennas, but they are connected to the "Liason Antenna Changeover Switch".
HTH
Tony H.