Yes, i knew that. But thanks for the hints, maybe its useful to someone else 
Edit:
By the way, which parts do I need from SmashTV besides the PCBs and parts?
I think I will need Cable, MIDI sockets and LEDs.
Awesome! You seem to know exactly what youre doing so!
Which cable, and how much will I need?
Well you will need the ribbon cable smash sells, to connect the LCD to the base board.
You will also need wider ribbon cable to connect the 2 PCBs together.
I think the one wilba used is in the wiki, its a stiffer higher quality one,
which is less likely to break.
Also look at the recent thread by fuzzylizard to see strategys of connecting the 2 pcbs together.
Which MIDI sockets fit into the standard panels?
Midi Sockets are supplied with the base board parts kit,
and they are PCB mounted, (pins are soldered on the pcb
), not panel mounted.
The back panel is designed so the holes fit right over them.
I did not count them, but I think 100 LEDs will be enough?
Pretty sure 100 will be enough, if you have a look at the mb-6582 parts list,
on the wiki page, it will show you how much you need.
Youll also need a 20x4 character LCD display,
i think maybe this should be added to this bulk order too,
in pings listed i see LCD Screens, which i presume is the window that covers them.
Is there anything else I forgot?
4 X Dual Gang 500K Potentiometers are an extra, if you want to do the feedback mod.
Also you can add that DB9 connector (the one that looks like an old printer port),
if you want to do more mods, for example, hook the audio input of the sids upto it,
and make a DB9 male to 4 stereo Audio jacks cable.
Other extras are a fan, and heatsinks for the sids if they get hot.
The heatsinks can be seen the same thread by Fuzzylizard.