We're just about to move over to Tessitura and TNEW and want to use the opportunity to build a new website. We've interviewed numerous local Web Developers within our budget and none of them have experience with TNEW. Does this matter? Is there anyone you recommend?Thanks!
Finding a design firm with TNEW experience might not be easy, but you will need to be able to describe TNEW's CSS structure to the designers.
However, you should know that the next version of TNEW will feature a fairly major change to its presentation layer, as they are moving to Bootstrap. I would definitely try to do any design work around the new version, and look for a company comfortable with Bootstrap.