If the motors are pre 3006, the coating Yamaha used back then is suspect. Once you see aluminum, it will wear. You likely get 5 or more years but eventually, if the top is breached the motor is toast.
It's a common problem. The meter is bad. You can't get the exact meter anymore. You have to order a kit. You'd have to cut the panel to make it fit. I chose to live with it. It says 120VAC maybe put a sticker one it if It bugs you.
Small screws near the weep holes and then push up. You'll see how easy they are to recover when you get em off. Monel staples, fabric and foam. Can get the fabric, foam and other stuff online.
Ask for pics and do your dilligence with short time members or few posts. There have been scammers here before...
I'd def contact A&J. They do them for GW and will know the boat.
My experience with the website is in the middle of the two above. A tad slow and expensive. I did a custom logo with a local shop and had my own sweatshirts done.
Slip is locked in, cover off and this upcoming week the wash, wax and bottom paint to begin. We're finally having some nice weather so gotta take advantage of it.
They were a custom resin transfer molded part made by GW. I think your best bet may be to go see a cabinet maker and see if you can have one fabricated out of a starboard like material or maybe wood.