I haven't seen much posted on this site from folks who have done this but maybe someone will chime in. If not you may want to try other sites such as BOC (Bayliner) as I know there are several threads on this there and all brands are similar in this topic.
Basic outline is pull up carpet, then flooring, inspect stringers for damage and check foam for holding water. Then rebuild in reverse flow.
Please post your work here to help others.
1997 2400 SCR
5.7 Vortec / Bravo 2