Nimrod is a classic lesson in why rebuilds from scratch will always go badly badly wrong.
I thought it was grafting precision built new wings on to old hand-crafted variable dimension fuselages that was Nimrod's downfall. Complete new build wouldn't have had that problem.
And, as the P3 re-winging seems to prove, you can build old designs with modern tools and techniques................so if the platform gives you the performance characteristics you need why not stick with it?!