Well, after waiting since Dec 2018 my Voigt 5 speed gearbox just showed up. Amazing shipping time: it was picked up this last Friday afternoon from Alan Voigt at his Wallasey (Liverpool) shop and arrived at my residence in Napa, California the following Monday morning. Even counting the 8 hour time difference, really fast.
A lesson to this fast time perhaps is that I did all the paperwork from my end. Alan didn't have to do anything except package the gearbox. He didn't even put the shipping label on it. Shipper did everything.
Happy to assist any others who might be shipping from Voigts in the future. Critical to get the customs forms (proper commodity code) and packing list set up correctly to avoid delays. Shipper (Transglobal Express - via DHL) makes an easy job of this online.
The shipping cost of 150 pounds, I also thought was quite reasonable, considering the 55 kg shipping weight and distance. This was for "regular" Express handling. I did pay another 50 pounds for insurance (the gearbox, after all, was 3500 pounds - with a full new BGH close ratio gearset installed). And US customs fees were another $150. So, all in all, not an inexpensive proposition.
Now, I have a project to keep me busy during the virus lockdown. After I disinfect the box as recommended.