Bill,
Sounds like a great project for your grandson. I may propose maybe trying to have a sound original replacement stock fitted up to the action first. It can be altered to whatever dimensions you want for him. This would be the most economical option.
Whatever you decide to do, it will no doubt be a perfect thing to leave him that he will cherish for his lifetime.
And I would not recommend altering the chambers on the 0 frame 16g.
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B. Dudley
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