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Hi Chris,

My opinion is K-Net since it's good for node-broadcasting and pretty sure for forwarding, And Scenario 2 with backbones for sure. You'd need a second radio at the mountaintop site for the backbone freq. The forwarding script I'm not sure about; K-Net is Netrom-like and does link with BPQ but I don't know the full details on the limitations. In Puerto Rico the network is almost exclusively BPQ, but there are a couple K-Net nodes linked in.

Is using HF NVIS a possibility there? If the stations on either side of the mountain are close , then NVIS would make the mountain disappear, eliminating the need for the mountaintop node as the middle-man. The ACDS sections of HF allow high baudrates now, so I imagine a 600-baud, 1200-baud or maybe even 2400-baud standard AX25 AFSK signal would work as a backbone since they are still within the now FCC-legal bandwidth (depending on the quality of the signal). There's also the IL2P variation of AX25 which is supposed to have better performance, which Direwolf and Soundmodem both have, besides the Nino TNC..

Also, for a backbone, ARDOP or VARA would work really well since the two stations would be a dedicated link only between them (ARDOP and VARA only allow one connection at a time).

It would be a cool experiment for sure to see how well NVIS worked between the stations especially of they're pretty close. NVIS refracts not only from the F-layers but also the E-layer. For whatever reason, a lot of NVIS documentation doesn't say much about the E-layer, probably because E-layer skip isn't as strong as F-layer, but I have seen it mentioned in a couple docs and I've seen it work. The further the stations are apart, the less strong the NVIS signal from F and E layers will be usually, since the signal has to pass thru more D-layer.