Re: 1990 19' galaxy floor replacement
I rebuilt an '89 Galaxy 190BR last season and found that I didn't need to remove the cap to do the job. This was only because I found that the section of sole supporting the bow area was okay, so I just redid the entire cockpit as well as the center 2 stringers and transom. I did almost the entire job with a Fein Multimaster using the wood/metal cutting saw blade and I'd highly recommend you use the same or something similar. It was the only tool that I found allowed me to grind without burning the glass like a grider as well as allowing you to grind right up against another surface (i.e. grinding right up to the outer edges of the hull to separate the deck from the sides. The hull kept its shape perfectly fine on the trailer with the cap still on, though I did do one stringer at a time out of paranoia.
For removing the transom I found that given the way it was molded it wouldn't have helped any if the cap was off because it stopped short of the cap joint and there was no clearly defined cavity into which the transom 'slotted in'. In fact it's a pretty weak transom stock, and I'd recommend replacing it if you're committing to the work to do the deck and stringers. Mine was actually 3 separate pieces where only the center third was the proper thickness for the transom plate and the two sides were just 1/2" glassed in flush to the center, which sort of pissed me off when I discovered it. Basically that stock transom can't properly transfer the drive thrust into the stringers through the transom wood. I made sure my replacement was a single 1.5" thick piece (well, 2 3/4" pieces joined together) that firmly butted up to both my new stringers.
It's not hard work, but it's a LOT of work. I found material removal to be more tedious and time consuming than installing new material, generally speaking, but that's not to say that measuring, cutting and fitting the new stuff isn't tedious too. Hopefully you don't have to re-do every square inch of vinyl upholstery like I did. That's a separate project in itself
