I think if being complete, like "noise bible", is impossible, then aiming for incomplete is acceptable. It should never be about whether everybody is mentioned or if all discographies are catalogued in utmost precision. Also to find out every local "era" would be unnecessary when looking bigger picture. It would be tough job to be the one to decide what actually is THE relevant, without being too biased.
Even Finnish "scene" could be divided to much more than 2 parts I mentioned.
If we forget the experimental sound in general and focus on what is more "industrial", one could look the Finland in 80's, when there was both international connections, but also total isolation. You could acknowledge the pre-Panasonic industrial noise works or Musiikkivyöry or such projects. Perhaps also a bit of Wolfsage or such quite obscure ones.
Currently quite well known artists born in 91-93 era could be Bizarre Uproar, UND, Grunt, etc.. who all did also international vinyl releases quite early.
It wasn't until maybe '98-2000 when finally more recognition was gained and with burst of related projects appearing and beginning of live activity, it became more coherent "era". Also one should always remember KMY live activity as group who brough plenty of CMI artists to Finland and also same time allowed lots of domestic artists to get to play (grunt, pain nail, cloama,
strom.ec, gelsomina, etc etc)
Perhaps one big change was the Bizarre Uproar's return from hiatus. New approach, lots of live activity, launch of label, plenty of visibility and new bands, people etc.
I'm very glad to see that there is new labels, new gig organizers, even zines, new projects as well. And not just side projects of old pervs, but fresh blood.
Genre operates often based on myths. As mentioned in some threads before, we still talk about riot in Whitehouse gig or people still mythologize for example Exuinox Event 83-84 (dm52, club moral, ramleh, Pure, Krank, etc,...). But talking to some people who was there, it might be just poorly organized gig. But nevertheless utterly crucial. I would consider perhaps one crucial point the Private gig in Mellunmäki plywood hall (COT, BU, Gelsomina, Above Suspicion, Restraint). If it was 50 people or something who really was there, I still consider it among one key points of current development. It has grown to exists in slightly mythical dimension. Perhaps same could be said about '98 FA fest, which really was pretty poor in modern standards, hah, but the stories people later told about their experience raises it to another level.
I have toyed around doing a book. But, perhaps just about Finland, since that's what I know and those are people I can reach for comments and ideas. Trying to cover past decades of countries as a guy who wasn't there, will not be as easy. Also it is about asking what for the book would be created?