Not sure exactly what are you asking...
By saying your uppers are triangulated, I'm assuming you mean the small amount that the stock uppers have...Not enough traingulation to locate the axle without the track bar, but it is enough that it'd bind if you put a stiffer joint (heim or similar) in place of the squishy stock rubber ones on the arms.
If you beef up the mounts, and make your long arm upgrade (including a longer, single upper) and keep the track bar, that should work ok.
Granted, I don't know you from Bubba, and you may be a natural fabricator, but
I'll warn you about the project...For anybody (ESPECIALLY for your first build,) making this drive right and be safe is gonna be a BIG project. Even more so if this is a daily-driver. Lengths, angles, separation and such are really important. Problem is that there are so many variables in a project like this, that you shouldn't trust some internet fabricator (me?

)to tell you what exactly to do. You need to find someone who is experienced with jobs like this, and have them help (at least "consult") IN PERSON with the project. Or maybe have a reputable shop tackle this one, and hang around enough to see what's going on.
That's my thoughts.