Earlier this month there was an interesting thread about the Lampyridea. It took me some time to locate my research material, hence this delayed contribution.
I too have collected material about this aircraft for years. My interest was awakened last year when I heard that two scale prototypes have turned up, at the Berlin-Gatow Luftwaffe Museum and the F-104 Museum in Niederalteich. I found one rather obscure source of information, that contained two interesting drawings. The source is 'RCS Determination for DLR Stealth Design F7', published in 'Non-Cooperative Air Target Identification Using Radar, Meeting Proceedings', NATO RTO (formerly AGARD I believe). Compared to the Flug Revue and Jane's drawings, it has three extra facets on each side of the rear fuselage:
Rob My models: