Welcome to CHR! A couple of questions, to maybe focus the responses a bit? You say "Model A", and specifically a '31 chassis, but then you say "...a swept front rail, suicide front end with a transverse spring, hair pins or maybe wishbones, a Z'd rear with a 4 link and coil overs." A suicide front end is more of a T-bucket thing than Model A or Deuce. Not that you can't chop off the front rails and hang a suicide mount out from a tube, but that doesn't seem to fit with "...swept front rail". Also, you say you're going to order a chassis, but then you ask for suggestions on a builder? Are you looking for a shop to do a car for you, or are you looking to build a car? Either is OK, but looking to focus a bit.

What is the "look" you're after for the final car? If you're solid on Model A ('28 to '31 model years) have you thought about mounting the body on '32 rails, which are unique and have a lot of sexy features? Roadster, coupe or sedan? Fiberglass, original steel or repop steel? On another thread the discussion has brought out that from Model A, to Deuce, to '33/34 the cars get both wider and longer on the interior space. Something to consider, too.

Enough of my questions. Welcome, and hope you'll take time to provide a little more info on where you're wanting to end up, and what path you're wanting to take.