So am also looking into this awesome looking frame, already have quote from LT.
I am curious about sizing, I also have the VB-R-168 road bike in size XL / 58 cm ish with a 42cm handlebar.
189 cm high and looking more for comfort that aero. Would 58cm also be the natural choice for the GR/GV201 frame?
Right now i have a 42 cm handlebar, but based on recommendations from this thread I think i will use the Lexon Unox handlebar that have 20 degrees flare, would it make sense to go with 40cm instead?

Now I just also need to find the right color/design that might be the most difficult thing

VB is known to over promise on timelines. They are a broker, not a factory, and they sell a lot of frames at the cheaper end of the spectrum, which means it's in their interest to book sales and worry about things later. When they give you fake deadlines, they probably aren't outright lying, they can always say that the factory had unforeseen delays. You dont buy a VB for the white glove service, let's say.
I ve bought 4 frames from them.
My advice: just like you shouldnt buy a phone because it promises you features down the road that currently dont exist (i'm looking at you apple), you shouldn't buy a VB that's not in stock.
Also, it's inherently riskier to order the 1st frames coming out of the mould vs a model that's been in production for 6+ months.
And VB has a history of modifying things on the fly, such as the C ring that needed changing to get rid of headset play.
Also, btw: it's a 500$ frame, via a broker. Which means you have 2 mouths to feed, not one (if going straight to the factory / OEM). So, while they have volume discounts, it's still a layer that can be avoided.