You're under budgeting in what you need to get started. Don't take this the wrong way. But from what I'm looking at you haven't grasped the concept of control voltages yet.
Planning out a rack without understanding how each module interfaces with the system as a whole will mean a lot of money spent in hopes of a functional system with even more money spent once you begin learning how the ecosystem works.
The concept of an ADSR, for example, is pretty common among all synth platforms. But the HOW of getting an ADSR to work in Eurorack is as important as its use.
Can you run me through how you would create a desirable sound in this set-up and control it? Including the patching? If you can't, then you're building your rack blindly and its going to end up costing you more money or disappointing you.