You actually have a lot of choices. I have friends who bought used
commercial kitchen work benches, or big shallow sinks, solid metal,
and used those. I have a really big old wooden “sink” left from my
printmaking days, which is a really long fairly shallow surface, and
I have covered one side of it with fire bricks for the base and fire
bricks for the back, and formed a little “kiln” sort of area of fire
bricks for when I’m melting metal (helps hold the heat in). They
also sell soldering surfaces from jewelry supply places. I went with
the fire bricks because I already had the wooden base, and fire
bricks are really inexpensive where I live - plus they are thick,
and are lightweight and easy to shift into different configurations.
The commercial sinks/counters I’ve used at workshops are nice, as it
is a big solid surface with a backsplash, so no worries about errant
flames or splashed chemicals.
Be sure to have a working fire extinguisher nearby, and to use some
sort of tank holder to ensure your tanks are never in danger of