Hi Lykos, it sound like you have a nice project planned there.
I think you are just right for a M90 single hammock. I hang on Dynaglide UCR's and I'm 200 pounds. I am 6'-1" and like 11' long hammocks. I think you will be most comfortable in a 10'-6" hammock but could probably get away with 10' and give up only a bit of comfort. I would keep the width; by the time you lose the selvge and double roll the hem, it will be about 55" wide.
"Life is a Project!"