Purchased a 1984 Cal 27 MKIII that needs some TLC I'm willing to take on but would appreciate some insight and possibly some tips on repairing a dished, cracked area below where mast is attached to deck. Boat had leaked at chainplates enough to rot bulkhead so, will have to replace it. My main concern in the settling, dishing on deck. Compression post looks okay but am not sure if it goes all the way down to keel or how it is attached. Would appreciate any info on that. Another concern is, if the post attaches to cabin ceiling, could the area, fiberglass, core, decking, between post and where mast steps be compromised and/or compressed? Want to do a proper and safe repair so, any info, advice, tips, would be greatly appreciated. Thanks.