Hello,
There is a big pdf list (http://containerinfo.co.ohost.de/) of container ships to be found on the internet.
The first time the length of Vermaas was published, it had a Loa of 336.60m and Lpp 314m if my memory is good. Well, I noted it in an Excel sheet, with a draft of 15.00m and a power of 68520kW.
In the list one can find such ships of 338.20m and a beam of 45,60m, after having searched for "45,60" in the list (comma, no dot).
Also, the name is derived from a ship designer (I think) famous for his achievements, also credited by VStep.
Regards,
Luc