if they form a society conductive to long-term pursuit of the project

Why would they want to?

This is part of a hypothetical intended to explore the issue of technical feasibility of developing technology using only dolphin bodies (underwater, etc.). This hypothetical removes two other most obvious issues in order to focus attention on this one. It removes the issue of developing useful-in-practice understanding of science by assuming that we have modern engineers. It removes the issue of unfavorable incentives by assuming that the incentives are directed towards the project.

You can explore other issues in other hypotheticals.