Why wood burning stoves?
I started researching about efficient wood burning stoves when the gas and electricity prices shot through the roof. I also had some cheap source of 'scrap' wood from some furniture makers.
Surprisingly I found a lot of info on the internet.

After toying with a variety of ideas, I decided to make a stove out of a retired 'cooker'. In brief: The excess parts were removed. The L-shape of the "rocket" concept was put in place using sheet metal. And the inbuilt insulation of the cooker was left in place.
Rocket Stove

One of the improved portable cooking stoves is the Rocket Stove developed by Aprovecho11. The special advantage of transportable stoves over other “improved cooking stoves” is that they can be ignited outside the house (the short period when smoke is produced) and brought inside to use. Most of the mud-based improved cooking stoves are in fixed position (in the kitchen) and still produce smoke when lighted. When the stove is burned out, the transportable stove can be taken outside the house for cleaning.