Need an experienced rocket mass heater builder to build one in Costa Rica

Hi ya’ll, we are building our eco house and homestead in the mountains of Costa Rica close to Chirripo mountain, it’s really beautiful and the air is crisp, we want to have a mass heater installed but although being capable permies,  both my wife and I are experts on food growing systems, but complete novatos when it comes to mass heaters...
Anyone here has the knowledge and experience and is interested in coming to help us?
We would be happy to cover flight (if from US) and lodging and food..
maybe turn it into a workshop? We know a bunch of permies in the hood that would love to get their hands in the mud... thanks! be in touch!