Both the air chamber and the underside of the reeds, against the pipes, have a gasket. The one against the pipes I nearly tore, because it sits against the wax of the reeds. Luckily it's a rubbery flex piece.
Anyone reading this and doing the same: be careful!
Plexiglass sealing the air chamber comes 'easily' of it's gasket. Be sure to keep your arm on it when removing the last bolts, because the springs are loaded.
To help you with that, the springs are clamped on the valve assembly. This piece sits completely free in the slot.
All valve parts out of the air chamber and lined up.
Keyboard assembly removed from the pipes 'block'. This piece is a massive block of plastic and has a black powdery coating that seems strike resistance. The wood piece is glued to the 'block'.
Reeds waxed into place on the pipes. They sit above a slot running straight down into the base of each pipe. Once assembled, on top of the reeds sits a rubbery gasket that stays in the keyboard assembly.
Keyboard assembly. Here you see the gasket and you can look straight through into what normally would be the air chamber. On the right side is the air intake, where the mouth piece goes into.
The top piece only comes off once all screws on the inside are removed, the biggest one inside is retaining the black cover piece. Once the cover is gone, you can undo the two bolts here visible next to the air intake, then the wood piece slides off the air intake.
Now to cleanup and put back together!