Going to need a cutting torch.

A saw will come in handy.

Will needs lots of angle iron.

These look like some good parts.

Grinders are a welder's best friend.

Inside of the fire box. This is probably the secret of why this thing works as well as it does. These baffles on the bottom or back side work very well.

Finished baffles. They have adjustable plates to change the air volume.

Back side of the firebox.

Side of firebox with vent.

Smoke path going to vertical chamber.

Vertical chamber.

First shelf:  note the brackets on the left are also installed.

Shelf frames.

...more shelves.

All done.

Horizontal

The horizontal was already a pit. Just removed the firebox below, covered up the hole, sealed the middle smoke stack and moved cut a new one on the far side.
Here is an early pic after rescue from the yard.

Connecting it to the firebox.

Butterfly valve is located in this path.

An early pic of finished smoker.

An early morning engineering session.

The first cook (only vertical chamber was built at this point).