Martin's Builders [www.martinsbuilders.com
Did ours a year ago.
Super quality work. Great team.
We had an architect too - so we had drawings etc, like you. The architect we used drew up a request for tender and sent it out to four contractors for the build. Meant we knew we were comparing apples with apples.
Architect also PM'd the project for us - fairly light touch, but it made it all so much easier.
Might be worth asking your architect if they offer the same.
This is the work
If you want more details, PM me.