The 30D is located between the Glass Fiber console that makes up the "driver's" seat and forward dinette bench. There is just enough space for it in there. To get at it you simply unbolt the whole console from the floor. The furnace is bolted to the console and the combined intake/exhaust goes through the hull a few inches under the rub rail almost amidships. This is insulated by a thermal blanket since you can physically touch it if you sit at the dinette.
The 30 D allows 3 outlets which are independently variable. We have one which goes inside the console and exits form it's rear, starboard corner unde the dinette table. The second goes forward and exits through the storage box just to starboard of the captain's feet. Since we have a raised, slatted, mahogany platform in that area it make a nice rack for drying shoes and also directs heat over to the Admiral's side

The third outlet goes further foreward to exit just above and behind the head which warms the whole V berth area.
As we do not have a grey water tank, the Diesel fuel tank for the Wallas is located right under the hatch in the cockpit. We keep a spare gallon of diesel and also of gas in there since it is vented by the blower. Will try to take some pictures later today.
Hope this helps,
Merv