Building a brazing hearth

I need to build a brazing/soldering hearth that can be mobile. i.e.,
not made from brick and cement that is fixed to the building. Using
steel angle and sheet. It needs to incorporate a hood to catch and
extract fumes. A support for fireproof material to solder and braze
on. It needs to be not too heavy so that is can be transported, and
not more than 2’6" deep so that it can go through an average door.
All suggestions would be gratefully accepted.

Richard
The first step is a journey of a thousand miles