How to restore Creasote & klinky(marine ply) ? and teak

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We have a 1960's timber house.

It has a flat roof covered in riverstone and is supported by large creasote soaked timbers. Many areas are fine and according to the old owner/builder have been untouched for 40 years. The roof overhangs and is lined with "klinky?" and where maintained has been replaced with marine ply. The inside ceiling is also "kiliky?" and the walls burmeese teak vaneer or redwood with a darkish stain

If it helps was designed by Mortlock of <!--StartFragment --> Ancher Mortlock and Murray

SO

a) In areas where the creasote beams are showing age can I simply slap on creasote? If not what is the best mix. (personaly I am not supper keen on working with the stuff)

b) This klinky/marine ply is also looking dryed out in places. Should I use linsead oil and turps. My Estonian father says that I should add pine tar or similar.

c) what should I treat the burmeese teak and redwood with