I’m gearing up to finally start a modular system and hoping for a bit of feedback as there’s soooo much to learn and tons of very kind, smart, and experienced people here on lines. 
Looking to build a small rack for live performance based on samples, loops, effects, and modulation:
The idea is samples and live looping in the Bitbox, with samples also being able to function as synth voices. Sewastapol II handles guitar/mic/sounds in and allows adding external effects. Pam’s and Sinc are modulation for everything along with the envelope section of Sewastapol.
Questions: I want to be able to have this system work with midi devices – particularly Norns/grid, iPad, and midi twister fighter. The Bitbox has midi in, but no usable midi through so I need a separate module. I put Ansible in there to handle onboard sequencing with grid, but also to act as a host for twister and Qunexus. I know that Norns and iPad would need a host2host transfer device. I need to dig back into the Ansible threads but seems like this will work well. Opening it up in case I missed something or there are other modules I should check out.
Power: I’ve been reading so much about power and it’s really confusing. Seems like everything I read has some warning about don’t do this or make sure you do do that. Additionally – although not a huge concern right now I would eventually like to be able to power this with a small-ish battery in case that excludes certain options. I’d jast nab the Polyend Anywhere but it only has 1a of +12 and all my computer modules are really taxing. Not showing power in the rack because I am building my own case and will put it on the back or side.
Appreciate any input/criticism/suggestions you might have. Thank you!