Since you are new to boats
there are no boat level manuals. they never existed. in many cases there is no documentation other than a notebook on the factory floor
The boat hull is either made by the boat company or bought from another boat company.
the boat interior is either made in-house or bought from one of the many boat upholstery shops. if you need interior parts, see your local upholstery shop
boat windshields are generally Taylor Made Systems.
https://www.taylormadeproducts.com/windshield-glass-solutions/
if you need a windshield for a 38 year old boat, make sure you are ready for the sticker shock
engines/drives/controls/and sometimes gauges are packaged by the boat engine companies
there are 2 wiring harnesses. the harness between the engine and the controls came from the engine company. the rest of the boat was made in-house or bought from a local harness shop
lights, vents, snaps, cleats, etc. were bought from various suppliers. today they may come from 4 or 5 different sources in a given week.
what specifically are you looking for and we can point you in a direction