Work on the Heavy/ Extra Bold weight of Silverback  is progressing nicely (if not frantically).  First pass at the Glyphs is done, with a ton of tweaks ahead.  No spacing or kerning  is really done yet, but that will come in time.  This weight along with the regular will be used to interpolate the rest of the family.  I am also curious to try Tim Ahren’s Font ReMix Tools to develop the condensed and expanded weights. Hopefully I can get far enough along to make the submission deadline for FontFont’s spring meeting.