An ELW is already "terraformed," by nature. Only planets that are close to Earthlike but have a feature that needs modifying (like a poisonous atmosphere) would require terraforming by human tech.Since my OP, I've been out in the black. Keeping well off the beaten track whenever possible. I am now the proud owner of 12 Earth-like worlds. But sadly, not one single one of the them are terraformable. That search still continues. What are the odds of that?