You do not say precisely what you have in mind but I assume that you are talking about adding internal framing. I do not know of an easy way to reinforce the hull with a hull liner other than to temporarily remove sections of the liner, build up the internal framing that you wish to add, and then glass the liner back in. You may also look at developing as sytem to reinstall the liner in a manner that allows the liner to be removable, or leave the liner out if you are going offshore. (I personally think that liners are dangerous on an offshore boat because they limit access to the hull should you be damaged underway.)
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Curmudgeon at Large- and rhinestone in the rough, sailing my Farr 11.6 on the Chesapeake Bay