Well, frankly I ended up buying one of those small stainless steel circular smokers that are foolproof.
I have had smoked fish all around the world and the second best comes from a smokehouse in Craster England.
I use the simple old receipe of rubbing the flesh side with salt and brown sugar then smoking in said smoker and eating immediately for hot or letting it chill in the refrig for about 2 hours for a cold treat.
For normal size and thickness fillets it takes 20 minutes a load.