Hello pico, thank you for your feedback 
yep, it's a very good idea to offer also a basic design, it would give newcommers a better understanding of what is essential for an arduino board.
There are plans for an ICSP port (because it is simply a must have). but sadly i didn't had the time to add it, but it is planned for the first update.
my plan is to make a pinout for the attiny2313 too and connect both to the ICSP port, so you have the abillity to reprogram both MCU's.