Can someone help with an interior fini****ng guestion please?

I have a 1972 Fraser fibreglass sailboat.  The interior is huge and has 
potential, the mechanics all work, but the interior is from 1972 also. 
The 
layout is just so wrong.  I have hit a wall.  I know I want to gut the 
interior, I just don't know where to start or where to go from here.  I 
don't want to spend a great deal of money, so would rather not hire a 
****pwright.

Please any ideas could help me.