Wight Mk1

I have just bought a Macwester Wight 1972  Mk 1  from a boatyard in Cumbria . I am hoping that some kind soul can advise  where I can access plans in respect of the internal layout for this and the later Mk 2 .. which presumably was an improvement? Although a bargain,this boat will need a full refurbishment and I need to know  where and what I need to go with this …so please…all / any help would be much appreciated  David