Vacuum bag. This will go to 4×8 but I have it set up just to handle instrument bodies, about 16” x 36”.
Router duplicator, Marlin brand, made really for signage but I use it for instrument bodyage.
-- "...in his brain, which is as dry as the remainder biscuit after a voyage, he hath strange places cramm'd with observation, the which he vents in mangled forms." --Shakespeare, "As You Like It"