Hi and welcome to the forum!
Just a couple cautions on your plans - first of all, transferring nursing credentials (or any medical-based profession) can be difficult. You might have some luck with US facilities in Panama, but other than that, you'll need to have the local language (Spanish, I guess) at a pretty good level to manage the qualification transfer.
Project manager is a fairly vague title. But no matter what industry, having the local language would be a major plus for your husband as well.
Check the consulate web site for Panama to see what the situation is regarding work visas. Usually, you have to find the job first and then your employer-to-be sponsors your visa application but the situation varies by country.