As someone who works in Embedded Design, who also went to college and obtained an Advanced Diploma in Electronics, and has friends with full EE degrees from University - None of us would be able (or attempt) to design such a card without many, MANY more months of research.
They teach you practically nothing relevant to designing such hardware, and of course nothing about the Amiga architecture. They give you a good overview of Electronics and Analog Design in general, but when it comes to Digital Design (ie: FPGA programming using a language like VHDL), and the associated PCB layout techniques required, you're on your own.
...I of course don't wan't to discourage you from getting into embedded hardware design, but you're looking at a very steep learning curve ontop of a diploma in EE to design hardware like that.
