I too would suggest a 4X5 XL enlarger. Either LPL Saunders or Beseler.
For 6X7 a 105mm FL uses the center of the lens and no worries about vignetting.
The Beseler 23C came in gray, blue or black. Gray is the earliest, Black the latest & blue in between.
All will do 6X7 but the later ones can be had with longer girders(taller).
For the large prints, any of them can be mounted on a wall or a table with movable shelves for bigger print size.