ModularGrid Rack

First off, I am a complete beginner in building custom Euro rack :).

I'm trying to build a live Eurorack hip hop rig. This will be mostly centred around sampling through the bitbox (or like sampler). I'll talk you through the signal flow. I want samples to be triggered by the Hermod sampler. The 8 tracks of the Hermod will trigger channels on the bit box. I also have an OP-1 which will be USB hosted by the hermod to send additional midi info. The 4 outputs of the bit box can be sent to either the effects (ripples or per4mer) or send to the mixer which will then sum the output.
I also have an Sv-1 black box. I will send this synth midi sequences from the hermod as a synth source and use the 3 SV-1b LFOS as modulation sources.

I am thinking of using the Doepfer A-100 LC3 Low Cost Case - 3U as my case. This will give me 4HP left to add an additional mixer or LFO.

Any thoughts on my mock up Eurorack setup? Am I missing something?

Thanks Guys :)