Not sure what you mean by "make it into a macrobinocular" :unsure?!
The Seagull, along with the Bell&Howell and the Kalimar 6/60 is just a source for a few of the needed parts to convert an Eumig Servomativ into the actual prop!
In this case, you´ll have to cannibalize the Seagull for the large dial and the smaller knobs. (plus the 2nd large knob for a possible stunt macros build). The rest goes straight into the scrap-bin
I´d say it´s "worth" between $40-100 as pictured
Do a search for Lukes Macros and you´ll find plenty of great threads and info :thumbsup
Markus