My perplexed Eurorack

Is this too many modules for a behringer go case

I'm unsure if I understood your question.
But if your question is about the PSU, it seems fine for a B Go.

How many modules does the behringer go hold

there are 32 slots to connect the modules to the power delivered by the go case. hipes this helps!

wow excellent

You may want to consider adjusting the layout a bit. The oscillator driver would be best placed next to the oscillator, as these work together, and the sequential switch would be more useful near the sequential controller. The later would allow you to use your sequencer in 24 note mode, if you so chose

Oops i didn't pay attention I'll do that