Hello Mete

> i think 2X a-100 miniature case is a good starting point for me..But i don't
> really sure which modules that i get..

I don't think, that 2 minicases ("beautycases") are a good idea. If you
want to use a module, which is a little wider, like for example the 104
113 or 101-1, then you would waste the remaining space, because the
standard 8HP-wide modules would not fit in there.

I definitely recommend to look for a used suitcase frame, or a lowcost case.

Regarding a recommendation for modules, it would be helpful if you tell
us, what kind of sound you want to do with your system. There is a big
difference between the modules for electronic dancefloor orientated
music and the modules for heuristic experimental noise sounds.