A little history. Before the invention of reverb tanks you only had a few options. Record in the kind of room that has the reverb reflections you like or use an echo chamber like the ones at Capitol Records designed by Les Paul. The ones at Capitol are 30 feet underground and concrete trapezoids which have been used on records for artists such as Frank Sinatra, Diana Krall and many others.
The concept of creating your own echo chamber is incredibly simple and will give your mixes and recordings a unique sound since no one will have your rooms. Yeah you could dial up a preset in Altiverb, but this make certain that your productions are unique from everyone else's.
