Please Assist in Identifying This Frame!
Nice looking frame. Some nice looking, desirable equipment attached to it too. Would be cool to see it finished off and back on the road. Probably holds more value if you keep it authentic to the era/leave as is. 

The holey bits are called the frame lugs, I guess they are ‘drilled lugs’ if that helps bring up any more search results. 

Possibly it’s from a big brand, or maybe from a small custom builder, made specially for your late neighbour. Either way it’s probably a quality example, someone’s gone to a bit of trouble making it. 

I think the more successful searches are for a bike with original branding and equipment spec from the biggest manufacturers. Then it’s a matter of hunting for archived catalogues etc. Otherwise it’s a bit of a guessing game/luck if someone else has the same one. 

But... get some more good quality pictures of the whole bike from all kinds of angles and keep asking around on various websites, maybe you’ll start picking up clues. I think it’s interesting/distinctive enough to warrant a bit more asking around. Maybe seek out some framebuilders and get their opinions.