With all of the information regarding classic equipment and re-interpretations thereof cataloged and stored on this site, why would anyone bother?
You can create a channel strip from a HUGE a la carte menu of equipment, complete with schematics, BOM's, parts sources, and even kits. An incredible amount of effort was exerted by those who have completed "Kid A" of a classic piece, and then there are multiple huge threads regarding what others did afterwards.
Search Avalon here and serious people just yawn about it. I have done b-face mods on them and do appreciate the quality of the construction and internal design, love the lighted switches, but would DIY something else.
Mike