In message , Fred
writes
Hi,

A neighbour has a rusty metal gate that he would like to replace. It
is fifteen feet wide but the few places he has asked only supply
replacements up to 12 feet wide.

12' gate and 3' gate with a pillar between them


How easy is it to make a wooden gate that size?

From the questions you are asking - probably quite difficult

Here - take this piece of string and tell me how long it is

What thickness of
timber would be required? I presume you use one or more thick
diagonals and either leave it open, or if privacy is required, nail
T&G on top?

TIA

--
bumsnase