So far, not too bad really. Honestly, you seem to mostly be having problems with aftermarket parts, even the shift coupler/safety wiring issue comes down to loose threads being cast (not cut) into the square head bolt. The safety wiring is an often forgotten safety feature, I've driven cars for years without the wire in place.
I can sympathize with your frustration, you're gonna need a crash course in VW mechanicals real soon. Expect almost all of the shinny new bits and pieces out of India and Mexico to fail over the new two years. The master cylinder will most likely be next, followed by an oil pressure sending switch failure or leak at the case fitting, so be prepared. You might even have some early trouble with the windshield wiper motor, depending . . .
It would be a very good idea to drop the car off at a good independent shop and have them grease all of the fittings, lube anything that swivels or pivots, spray white lithium on anything that moves, and check all of the nuts, bolts, fittings and electrics before you decide to trust it to a long(ish) trip. You have a LOT of parts in that car which were manufactured by people who HATE their work. A failing condenser or loose hot coil lead will leave you sitting there every time. Closed contact points are a wonderful mystery, especially in the rain, in the dark. Any electrical component ought to have "Bosch"
STAMPED on it, NOT on the sticker stuck to the side of it. These days, a "blue coil" is really just a coil that was painted blue. I've seen them for sale at VW shows. Often when you buy the coil, they keep the "Bosch" box and just put the coil in a bag. WEASELS . . . !
None of this really any fault of Thunder Ranch. It's just more cost-effective to buy and install a new repro than clan, blast, refurbish and paint an original German-made assembly or part. PLUS there's the claim of "all new parts" rather than "good used parts." The uninitiated think that new is better; with VW and Porsche, the opposite is always true.
It always takes time to fully sort out a newly constructed car; or anything, really. No matter the price or promises.
Luck!
TC