I, personally, have not seen the design...

Keep in mind, that I am no lawyer.
There are some truths to it, if you used their logo, that would technically be copyright infringement, unless you got specific consent from the owner (seems you haven't, in this case). As far as not being able to say "beer" or "brewing" that is completely wrong. As long as you have nothing left in your design that could be tied back to "warbird", I do not forsee a problem with that.
Although, in this situation, technically, he is in the right.

In the description of the work, did you mention that the design is using their logo?