But it's not so easy. You need to know simple electronics and communications protocols(https://electronics.stackexchange.com/questions/37814/usart-uart-rs232-us

But it's not so easy. You need to know simple electronics and communications protocols(https://electronics.stackexchange.com/questions/37814/usart-uart-rs232-usb-spi-i2c-ttl-etc-what-are-all-of-these-and-how-do-th https://electronics.stackexchange.com/questions/37814/usart-...). Read chips datasheet and connect it as indicated there. You need to know some electronic design automation software(like Kicad), to draw schematics and layout. Order board somewhere like https://oshpark.com/ https://oshpark.com/ soldered or solder it yourself. Put it all together with screen and hull. And maybe write some software:-)