Not quite guitar making as we know it! Sounds like it could do with a better set-up.

Not sure how well a truss rod would work in one of those bases with extended neck attachment to the body. Looks like it's joining at the 12th fret whilst the truss rod looks to extend to about the 17th fret, so adjustment won't be even over the whole length. Still, no worse than on some acoustic guitars with a 12th fret join.