I see it as a tribute to his grandfather, and that it is a labor of love rather than something to be ridiculed.
It’s an amazing story of the man who compiled those things, one or two at a time over the course of his life.
And it IS interesting to think that the grandson was so touched by his grandfather’s death that he wanted to preserve the things in the shed before they were given away or destroyed.
THAT I can understand and relate to. My grandfather was a big-time tinkerer himself. He would bring home stuff people threw away, fix it, and give it away to friends and neighbors. I wouldn't think of getting rid of his tools that he used and cared so much about when he was alive. But to painstakingly draw every scrap of stuff he owned would, frankly, be a bit weird, IMO. And I was an amateur landscape painter earlier in my life, so I do appreciate the art aspect.