Thanks for all the input everyone. Here's where I am so far.
Guido was incredibly kind and helpful and sent me the hafele parts and numbers (cut and pasted below for everyone). What a great guy! Guido if you are reading this thanks once more!
I used buyhafele.com which is based right here in Baltimore so I got a bit of a discount, but they ship nationwide.
Regarding the depth, I ended going 20 inches deep as I have about 20 drawers left over I want to adapt to the wall unit so I had to decided between going with the 14 depth for the systainers and then bumping out when I got to the 3 sections/towers with the drawers, or going 20 inches deep all the way across. Decided on 20 for a couple of reasons mainly, 1) makes it more flexible if I want to change stuff around in the future and 2) makes fabrication, faster, simpler, (for me), if main components are basically the same.
On another thread someone mentioned CHS for slides and service and I got a great deal on a bunch of closeout 20's so that should take care of the systainer depth ( there will be some dead space behind the systainer section but overall it works better for me. Yes, I'll use a bit more material but I'm a bit "overstocked" on sheet goods so this will be a good chance to use some of it up. [unsure]
Drill jig looks sweet, but dear, when it comes to price (poor pun, I know) LOL. [big grin] I'm planning on making the jigs Guido shows.
Besides the depth difference, mine will be shorter due to height limits, plus I may add doors to the bottom in addition to the top. My shop is somewhat narrow and though I'm mostly dustless, thank you Festool, some still gets away, plus a bit of paint overspray here and there. [embarassed]
I'll post pics when I'm done if anyone is interested.
Below are the part numbers from Guido fro the main hafele sight.
"Here are some links for the right connectors you are looking for:
Item #: 263.13.705
Rafix SE without Ridge, zinc, nickel-plated, 19mm
https://hachol02.hafeleonline.com/OA_HTML/ibeCCtpItmDspRte.jsp?section=11730&item=18327
Item #: 267.00.012
Sleeve Nut, steel, brightened, M4, 5mm x 18mm
https://hachol02.hafeleonline.com/OA_HTML/ibeCCtpItmDspRte.jsp?section=11730&item=18718
Item #: 263.21.817
Rafix Bolt, steel, zinc-plated, galvanized, M4, diameter 7 x 7.5mm
https://hachol02.hafeleonline.com/OA_HTML/ibeCCtpItmDspRte.jsp?section=11730&item=18371
Item #: 263.20.856
Rafix Bolt, steel, zinc-plated, galvanized, diameter 7 x 15mm, 5mm"
https://hachol02.hafeleonline.com/OA_HTML/ibeCCtpItmDspRte.jsp?section=11730&item=18367
Cheers,
James