The Kcrucible burner is based on Ron Reil's naturally aspirated Mongo Burner principle with adjustments based on Michael Porter's book and other hints from around the net, as well as direct experimentation. Venturi action is used to draw in air to mix with the propane jet at a wide range of pressures, eliminating the need for a blower. This is one of the simplest burners to build and can be done cheaply using off-the-shelf plumbing parts! DIY is definitely possible! For people that want an even easier burner (no grinding out slots) you can try try a sidearm burner.
The Kcrucible furnace design functions primarily as a foundry for melting aluminum, brass, copper, and hopefully iron and glass! In addition, side ports have been added to the side to allow usage as a vertical forge for thinnish bars of iron (5" width, 3" height) which is suitable for blades and small ornamental work.
By adding a less-insulated chamber over the top, the exhaust gasses should be able to be used as a burn-out oven and pre-heater for investment flasks. By closing off the exhaust ports, the chamber can be used for heat treatment.