Its a digital era now. Do you know 40 years ago how a computer or microprocessor looks like ? Its not to late to design your microprocessor, the heart of a computer.
A guy create processor from transistor.
http://www.megaprocessor.com/
Two guys create a TTL micro computer from around 50 logic ICs.
https://gigatron.io/
This guy also cool ! I learned a lot from his articles.
http://cpuville.com/
A resource for 6502 processor.
http://6502.org/
A serious book about stack machine also available.
https://users.ece.cmu.edu/~koopman/stack_computers/index.html
Now let me design my fetch unit state machine. Fun exercise to your brain !