Not a handy guy, but interested in Rocket mass heater build in Clackamas county Oregon.

I'm curious if someone in this forum knows of a licened contractor or expert who would construct or oversea a rocket mass heater build in Clackamas county Oregon? I was contemplating buying some plans and introducing and paying to have it built at my mom's place (The house is paid for, not sure how that affects permitting and insurance). Her old oil heating system needs a new tank and I'd like to see her go in a different direction, but don't want it to be amateur hour. She also is constantly going with out heat to save money and would like her to be able to heat her home in a more efficient way.

Any thoughts are appreciated,

Russ