64 pin SIMM (Mac IIFX) Specs?

I'll be getting a IIfx on Thursday and I can confirm (I hope) that the DIN and DOUT are common on the mother board at that time. Your advice has given me hope that this is much more doable than I feared. If they're tied, then I should be able to build a 16MB SIMM using two 16M X 4 chips. My concern was that the X4 chips do not have separate DIN and DOUT and I wasn't certain if the IIfx actually needed the separation. I think I have some 16M X 1 chips which would work in either case, but my supply of 16M X 1 chips is much smaller. If the DIN and DOUT are common on the MB, and I use 16M X 4 chips, I assume that I should either use the DIN pin or the DOUT pin on the SIMM but not both? Using both could result in different length datapaths which remerge, possibly causing interference from slightly out of phase signals. The difference in length probably wouldn't affect the timing much, but still... It would still be handy if someone has a mechanical drawing of the 64 pin SIMMs. I can derive it from a physical example, but I'm less likely to get the actual center measurement and tolerances correct that way. Hmmm. I'll check around and see if any of the socket manufacturers are still selling a 64 pin SIMM socket. If so, I should be able to derive the SIMM dimensions from the socket datasheet. Jeff Walther