I like the modules you choosed.
I think its a good starting point but more stuff will surely follow
PPl will say: "Get a bigger case"
Maestro is cool for (rhyrmic) modulation
Maths is cool, but I if its your only utillity it is to less
If you integate the minifreak you might spare the ensemble osc out
BIA for almost everything is nice
You would need a midi cv interface, if you want to control or sequence the minifreak or other synths with eurorack.
More utillity modules like attenuverters, matrix mixer, offsets, vcas etc
You could add a dedicated filter even if the Ghost has one integrated
Vcas
you need the exra intellijel output module for the intellijel case to get sound out of it.
Or a other output module for modular to line level output - or a VCA
Greetings
Chris