Yes, you can do same chamber smoking, but you may not get the temps down to where you want. You also limit your cooking area to half (or less actually, due to flare ups, and high heat being close to the source). Source on the left half, cooking on the right third, and that third will not be exactly even, it will still be hotter on the left. Not that great. I'd go for a separate firebox.
The firebox is a separate chamber and the heat and smoke are pulled through with airflow for even temps and smoke. You can modify the chimney by extending it down to grate level for a perfectly horizontal airflow that goes right across the meat. It pulls it from the firebox side to the chimney side across the whole grate. It's the way I prefer!
Good luck and keep us posted.
The firebox is a separate chamber and the heat and smoke are pulled through with airflow for even temps and smoke. You can modify the chimney by extending it down to grate level for a perfectly horizontal airflow that goes right across the meat. It pulls it from the firebox side to the chimney side across the whole grate. It's the way I prefer!
Good luck and keep us posted.