The design can be adapted to 80 Meter. making a suitable LO signal may be a bit difficult though.
Two 23.5 MHz xtals are required (27-3.5). These are non standard as far as I know. 30.5 (27+3.5) MHz can be used instead. Those are nonstandard frequencies too.
using 30.5 inverts LSB and USB.
23.5 MHz can be generated by dividing 47 MHz by 2. You could try to use a VXO at 20 MHz. Then double this signal and mix it with 7 MHz.
A band 300 KHz wide band filter for 80 meter can be found in the Elecraft K2 design.
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