Well now that you ask lol...
Here is the layout with radiator placement in blue rectangles.
The floor is slab but will be insulated XPS and furring.
Walls similar to about r30. The house is 3/4 below grade. Cinderblock all around.
The price is for a electric water heater. He mentioned some type that was suited for this type of use. I could also add about 800 for a gas boiler that would vent horizontally out the joists in the front through the cinderblock.
We calculated I would need 15,000 btu for this due to being in I think zone 4 in southern oregon but he wanted to aim for 25,000 output just to be safe.
4,000 btu for each radiator under the windows.
4,000 for the office
1,000 for bathroom
5,000 for the wet bar area