I've owned my Islander 26 for 20 years. It's an early Robert Perry design very similar to his famous Islander 28.
This design was produced in 1977 & 1978. The 77 was refered to as an Islander 26. The 1978 version was called the Islander 26 Bahama. Islander made some adjustments to the interior in 1978 in order to lower the selling price. It was a tough market competeing with several of the 27' boats such as Catalina & Hunter. Even with the lower price tag in 1978 the Islander 26 did not catch on. It's my opinion that the quality of the 26 is superior to most of the 27' boats built around that time.
I'm not able to assist you with information on the repair of the interior teak panels but I wanted to take a minute to assure you that it's a very fine boat.