TRS-80 "Eight Meg Disk System" questions...

Hi all -- Recently picked up a TRS-80 "Eight Meg Disk System" (model 26-4151) and the associated interface board, with the intent of hooking this up to my TRS-80 Model 16. On further investigation, it appears that the 26-4151 is a Secondary drive, which makes me curious as to whether this effort is going to be ultimately fruitless. So, without further ado, here's the questions I have: 1. Is it possible to get this secondary drive working as a primary, or am I up a creek without having a primary drive (or extra magic hardware in the drive I have.) 2. If I can work around #1, I need to know the pinouts of the drive and the controller board since I do not have a cable to connect the two. The controller has a 50-pin edge connector and the drive has three connectors -- 2 50-pin (labeled "Control") and one 20-pin (labeled "Data"). a. And as a follow on to #2, where would you suggest getting the parts and tools necessary to build the aforementioned cable? I've never constructed such a cable, and I'll have need to do so again in the future (need to assemble some long-ish ESDI cables for my PDP 11/73...) Thanks for any suggestions, Josh