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i made the one that's in the first picture, jdm2 i guess and I didn't even do it on pcb, i got it all jumpered and it's just perfect. pin 20 jumper means that, the connection from that pad on the pcb goes to pin 20 of the serial port of the PC
p.s. by the way, if you noticed jdm3 has 6 serial lines to program the pic, and more parts, which simply means it's little more complex than jdm2, although it is still under $5 bux to make it, so you make up your mind which one you want to make