Hi Synthy-Synthesizing,
Ha, ha, you are using an Doepfer A-100 case with 1U strips, does it exist? :-) Would be nice if they really do but I doubt it a bit. An Intellijel 7U * 104 HP might be a nice choice instead? That gives you a bit space to extend in the (near) future as well.
Without knowing what you have externally (any other stuff other than this rack or is "this it")? If you don't have any external gear then this looks a "bit" too less to me. If you have already some (external) stuff then perhaps good to mention.
Generally you need to look at least at some oscillators, LFOs, envelopes and don't forget filters, VCAs, audio input/output module, perhaps a small mixer, at least one sequencer to start with and perhaps some other stuff, it really depends on what you want and need. In your shown rack I see a few components but it doesn't look complete to me.
Good luck with the planning and kind regards, Garfield Modular.
For review reports of Eurorack modules, please refer to https://garfieldmodular.net/ for PDF formatted downloads