Masonry Heater

Right now I am using split a/c unit that  works for individual rooms but I want to build a masonary wood stove/ oven / heater at the center of the house. I am looking for the internal and external design of various types of masonary heaters? Something like this one in the picture below.

Sounds like a great goal, Adam -
You might want to look at Matt Walker's designs: https://walkerstoves.com/
I am building one of these designs now.... the plans have been really helpful, Matt has a lot of videos, and has been great about answering additional questions by email.
Also other options in the Rocket Mass Heaters forum: https://permies.com/f/260/rocket-mass-heaters

Let us know how it goes...

Hey Adam, Great Idea!  
Heating with brick is the best way to stay toasty warm!
Matt Walker's Stoves are beautiful and super efficient.
You might also be interested in Peter Berg's Batchbox design, with a brick stratification bell.
I have three, as well as a Walker Black and White oven.
Here are some photos