Classic build is a bit different then fully enclosed in sense that it uses original (version 1) pipe layout and may be extended to have removable enclosure.
There are few differences. Instead of “frame-plate-holder.stl” you will need to print 4 “frame-Z_2x_corner.stl” from version 1 (red on picture above). Version 1 links
There are 4 additional pipes for diagonal support 524mm for front brackets and 535mm for back.
Y pipes for gantry are 445mm in length.