if this isn’t currently being built by the coach builder, i would advise on measuring it before lifting a finger.
if its still being built, you could call the coach builder and ask them to give you the visible GRP height and width.
if this is a truck wrap, ide personally prefer to go and have a look at it myself.
there are often side doors and other obstacles that sometime need to be taken into consideration when designing.
as peter says, they can and often do vary depending on who built it
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