I am also building with Homes By CMA in the same area - just me (no partner ect) so it has been very challenging. Also my first home. I am at about the same stage as you! I don't hear from P anymore but I do hear from another member of Homes By CMA regularly which is really reassuring. I have had no problems really thus far, just with the bank.
So I am just waiting for the letter of commencement from the bank.
I am building a version of 'The Endeavor' I think it might be version 1.2 or something along those lines.
It will be great to follow your journey! Fingers crossed that we both receive our letter of commencements soon.