Kit parts for version T, version S has the the 3mm Red LED's already soldered on in SMT form.
The button has orientation, the flat side of the button is marked on the PCB silkscreen.
Solder the THT 2x5 power connector header.
Cut the little flap that sticks out from the top on the potmeter so it can aligh flat to the top pannel.
Put all components in, make sure the orientation of the LED's is correct (it is marked as ShortLeg or SLeg on the PCB silkscreen).
The big ON/OFF/(ON) switch has orientation, the temporary on part goes to the top side of the module.
Then screw the front pannel to the pots and jack sockets.
Put it all on a cup or SMTH to hold it so the LED's can go flat thru the holes and stick out all the same on the front.
Solder everything. I solder the pots at 275 celcius or so. The rest i solder at 330 or so.
Cut off the legs that stick out to much.
Now it should look like this.