VS has some unique features to look for:
For awhile it was a curly cue red wire off top of alternator.
Also the faux torsion bar cap -
And the chrome strip across the dash and the ~9" round air hole with hardwire cloth covering behind engine intake fan.
I think it is a VS - but maybe a roller finished in Japan since the dash covering doesn't end with VS signature, the interior is a nice custom one with the different color piping, and the engine compartment isn't properly sealed to prevent exhaust gases from being reused.
Doesn't appear to have a hood handle badge - VS made one but most went with Porsche crest.
Unfortunately many vendors don't use ID plates - IM did - placed in passenger door frame, CMC/FF had a gold plate supplied but it was builder decision to apply or chuck it, SE Beck too has a plate (but they are not built on a VW pan).