Re: 1802 w/a swim platform
I had installed a swim platform on my 1802 when I had it. You will need to re-enforce the upper mounting points with resin soaked wood in order to take the forces that will be exerted by a person attempting to leave the water and climb back into the boat. The transom itself is thick enough with plywood for you to bolt down below but do use fender washers. I had a Garelick platform with a folding two step ladder which didn't have supports under the platform. This is important in that those platforms that do have bottom supports will have the attachment points under water. Make sure you coat the inside of the holes with resin and then use Boat Life or 3M 4200 liberally to seal the holes around the bolts.
You can see my platform on the port side in the picture below. You will notice there is no "inside" upper support. This is due to the fact I ordered the model for an outboard. If you order the I/O model of this platform you will get two of the upper brackets. I recommend you go that route. You'll have to hunt Garelicks web site to find the model number as I don't have it here anywhere.
