I see what you're doing and I greatly appreciate it. As the owner of an "inheritance rifle" let me offer you a few thoughts.
Long before my father passed I knew all the guns in his safe. Some came and went while others were there from the beginning. Two of those "lifetimers" were a Winchester Model 21 with fine wood and years of wear, and a custom 7mm Wby my father had built in 1961 and used as his main hunting rifle over the years. Sure, he hunted with others, but this was one that he had made specifically for himself and treasured beyond the others. When the time came that my brier and I had to split up Dad's guns, I made a list of all the guns and rank-ordered them to what I wanted the most. He had decided hat he wanted us to draw straws for first pick, but that the second person would get picks 2 and 3 and then start alternating. Now he had all kinds of expensive rifles at were very high quality, a Shiloh Sharps and a RMR built 7RM in a McMillan stock. By all metrics those guns should have been at the top of the heap, because of their build quality and value. But in the end I knew that there was only one that I wanted out of that safe and I ended up doing some wheeling and dealing with my brother to get it. I gave my brother the first pick in a exchange for Dad's safe and I took picks 2 and 3. My brother took the Model 21, which I would have loved to have too, and I took the old BSA-actioned 7Wby. Sure, it wasn't a blueprinted custom LR rifle nor was it a custom BPCR rig, but it was the rifle that he had used and carried all over during his time in BC. That was why I wanted it.
So the point of my story is that, while you have a great vision in your head for what is undoubtedly a high quality rifle, do not be surprised if your grandson decides that he would prefer one that you had used and treasured rather than an unused safe queen.