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I don't think anyone has brought it up yet, but even if the PVA glue or whatever you're using is strong enough by the tests, that doesn't mean that it is suitable. Aside from creep, compressive strength, etc., you also have to be concerned with fatigue of a material. Fatigue is caused by cyclic loading. An example of the cyclic loading on a car is the bumps you go over. Over time, this will weaken the material and it may eventually fail.
There are ways to estimate the fatigue limit of a material. I personally do not know how, but it may be a good idea to consider fatigue before settling on PVA glue over epoxy. It may be worth waiting for the extra cash or just go ahead and buy the epoxy.
Basic information on fatigue can be found on wikipedia under "Fatigue limit" and "Fatigue (material)". I cannot post links because I do not have 5 posts yet.
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