Saint and Joel:
If you go to the TFG (Timber Framer Guild) home page and click on the light bulb shaped icon in the upper right hand corner of the page, which is labeled "resource guide" you will be taken to a start page. Follow the link, by clicking on it until you get to the search page.
On the search page are three boxes for you to fill in. Put design in the first box, your state in the second box and pick Design in the third box and the search will result in 127 firms listed with the TFG that do design work. Sort threw the list and try and find someone who is local to your area. These local firms know all the code rules for your area.
Also, do the same search by change the first and last box to engineering, and you'll again get a list of firms that do engineering, some 41 listed with the guild.
In addition, if either of you would like a quote from me, I've started a timber frame design service and I would be happy to quote either of you for designing your frames.
Jim Rogers
Jim Rogers Sawmill
Georgetown, Ma
800-422-6250
(Currently not listed as a design service in the guild resource guide.)