Fixing the teak on my cabin long deep cracks

[Merle]

Hello I am new here I have a chris craft 35' sail yacht 1963 it has fiberglass hull and deck but the forward and aft ccabins have teak running down the sides they have long deep cracks in them how best should I address this issue thank you in advance sincerely Merle

[Searles]

Pictures and much more information even drawings may help ,plus is the teak structural or just fashion pieces ,verry different .⛵️⚓️