Thats an awesome idea to use the 3d printed inletting block, the howa minis are perfect for this type of project.
I have thought about doing a similar thing but using super high density closed cell foam for the inletting area, but undercut from the action a reasonable amount (5-6mm) with lighweight foam for the forend and stock like you have done, then sheath the whole thing in carbon and use a milled fiber/silica filled epoxy to bed the action.
Why not go straight to carbon for the first one? Cloth for a project like this would only be $50-60 tops.
What is your plan for laminating? I have tried wet laminating stocks in the past with no vacuum and it is very tricky to get good consolidation around the tight corners. If I were to try it again, I would certainly use vacuum.
Ill be watching your project with interest.
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