Based on garden gates made by this method, I’d say that if water somehow finds its way in between the laminates (usually at the joint lines) and temperatures then fall below freezing, a long lasting door might not be the outcome.

Another reflection, if allowed: if the glue (epoxy, I imagine) were to block moisture from penetrating into the middle board, could that, given the strength of glued butt joints, result in the outer board still taking the two inners ones with it as it warps?

Wooden boat builders do a fair bit of laminating wood with epoxy. Might find some information by searching in the boat building world.

I’ve built and repaired a fair number of boats. The two glues that have never failed are the old two part cascamite plastic resin glue and the more modern epoxies. I generally just get the West system products because I’m familiar with them and the seem to have very long shelf life. I still have epoxy from the early 90’ that is good if I decristalize ir by warming it to 145°f. The epoxy will also be gap filling, so your clamping pressures need not be high. In fact, just moderate pressure so you don’t squeeze epoxy out of a joint.

If you go with epoxy, consider epoxy encapsulation, which is just coating all surfaces with a thin coating. The wood will be more stable and boats last longer. Encapsulated wood can still be varnished or painted.
Gugeon Bros, the West systems folks, have o
Lots of literature.

https://www.westsystem.com/wp-content/uploads/GougeonBook-061205-1.pdf

Glynne,
It struck me that once again I might have fallen into the trap of thinking I have some form of command of the English language. Hence, here’s an illustration on how I made that garden gate that only lasted for a couple of years, before the expansion of freezing water broke it apart.

While trying to find the term for “gluing faces together”, I found the link below – among some other concepts…

Face-gluing for thickness

In between all the posts there were a couple that possibly can be of relevance

Thanks Glynne!