This man is serious; he made a binder with the plans all neatly tabbed out inside.

Bruce does the exact same thing...and gets perfect results every time, so BMan, you're off to a great start!
Glad to see you've got the arrays COMPLETELY FINISHED already. They were the biggest PITA for my OTop build and very time consuming. Nothing inherently "difficult" about them, especially if you build the recommended jigs. They are just time-sucking black holes. It's good that you got them out of the way first.
Work (the real work, the one that pays the bills) along with the rest of your life always seems to leave little time for cab building. You said you want the rig done in time for the XMas season. You've got at least two months, so don't rush.
Compared to the DRs, the T45s will be cake, but not without their own challenges. Bigger panels are less fiddly to work with, but tiny errors become magnified over the length of a long panel.
I'll say this way in advance, and you haven't even bought the wood for the T45s yet; do not shove the braces in too tightly! I thought jamming them in there by hand "tight enough" was NOT too tight; it was and it caused me grief. Just a word to the wise.
Please take lots of pics. DR builds are always very interesting to see. Good luck!