With a friend we have bought on Ebay a 4808 motherboard and after careful examination and cross-examination with the 4708, 4000, 4200... we have, we came to the conclusion that you neeed only two extenders : one generic having the largest connectors choosen in each pcb card (all the same connectors)and a cut one at the left to accomodate the self mounted on the mother board (the 4th or 5th pcb I don't have the calibrator on hand now). The little everywhere positioned partial connectors for each pcb will find their place in the various and identical large connecotors. We have just finished the Gerber file and trying to find a company to produce a prototype because the dimensions a very critical and an error of positioning the gap between the connectors (0.001") shifts the contacts of the 4th, 5th connector and we are at the limits of our public software.