We use firstname.lastname@example.org and usually get a reply within a week or two. Liz works in the office and has a list of the usual questions with the usual answers which she will send on to you. Otherwise, there are lots of clever folks here on the website and you can get answers faster and sometimes with variety in the thinking which you may or may not decide to follow. Wharrams have had some health issues with James lately and Ruth also, so Hanneke has had a load to carry.
I always thought the Tiki 26 was the most beautiful Wharram design. Look forward to seeing yours some time.