I'll have to agree with the above advice. Any rebuild project
needs to start from a good base.
Why not consider building from scratch? There are some excellent small cruising designs available and the time/money/energy difference between a rebuild and a scratch build is not going to be that large.
I've built two boats (6.5m ply and 32' ferro) from scratch and just done a total fit out on Boracay.
25' is a great size for a DIY project
. Small enough to be completed in around a year or so and also small enough that encouraging progress can be made in a few hours.
If you do the work yourself you'll get an immediate feel for what can be done with the boat.
But do have a good look round at what designs are available and consider what your needs are. The true beauty of a scratch build is that on can build something that suits ones own circumstances, location, weather