This is an auction for a system on Ebay which might be interesting.
It is listed as a "Northstar Horizon" but has what appears to be a
single board system marked Ferguson. That would probably not be from
Northstar.
Also it is built up with 8" floppies which is even less related to
Northstar.
it appears he got a pile for a Northstar system with the Ferguson
homebuilt which is in an Incoterm box which holds the floppies. There is
a listing for a bigboard on bitsavers which is probably for this system.
http://www.ebay.com/itm/400301360595
Price may actually be something if anyone feels a burning need for a
Ferguson board, but I think its high for an ordinary Horizon. Too bad
there is a missing Horizon.