Yes, it has a truss rod; the neck is perfectly straight.
When there is no tension on the strings, the action is good (approx. 3 or 4 mm), when the strings are tightened the neck "dives" into the body to get an action of about 3 cm..... not playable. And then the guitar is not in tune ()
When I take the guitar unstrung I can move the neck into the body by appying pressure on it. There are no sounds or noises hearable. When I look at the wood there it looks "weird" (I can put holes in it with my fingernail). There is no dovetail
Hope it helps.
Oh, btw, this is a pic of that area