Can we use another glue such as non-chemical (like organic collagen containing) instead of PVA Glue?
I don't have any experience with that, so can't provide a definitive answer. However, PVA glue is designed for woodworking and is very strong. If done correctly, the wood will fail before a glued joint will, not sure if the same can be said for glues that aren't PVA.
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