@mariana739 If this fully occupies him so that he is not at your heels all day, and he is safe out there, I'm going to suggest that you take a deep breath and try to roll with it. Maybe "disappear" any heavy tools like axes, large crow bars and sledge hammers to minimize further damage. If the time comes to put your place on the market, just bring in a landscaper for a day or thre to set things right.
Why am I saying this? Because we went through the same with my father-in-law - except his was "organizing" the garage. What did he do? Emptied all of his previously carefully sorted screws, bolts, nails, etc into 5 gallon pails, sold or gave away most of his tools (which my husband would have loved to have), burned most of the scrap lumber in his wood stove... and was tired and ready to sleep when he finally came inside.
As soon as he past being able to do that, his behavior became much worse, with sundowners and anger predominating. Within weeks, my mother-in-law could not manage him at home, even with his brother's help, and we were hundreds of miles away, working and raising small kids, only able to come on weekends. He was moved to memory care, where he failed quickly, he was gone within 3 months.
So perhaps you can view this as a form of therapy for him, something that is keeping him going?