Re: swim platform brackets
Its actually very simple to level out your swim platform level to the water when the boat is in use.
First thing you do is eyeball it.. bolt it down and go into the water ..
Not what you want .. its ok.. unbolt it .. fill the screw holes with some PB .. do your regular gel patching buffing etc.
Then you Kinda eyeball it again this time a little lower or higher depending. Bolt it up again..
To fine tune it you might have to do these steps 4 or 5 times .. so make sure you have plenty of putty and gelcoat to repair your Test spots

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Did I get YA !! .. oh common .. I got ya didnt I

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Ok.. now for the Real way I would do it..
1. load your boat the way you normally do.
2. get 2 straight 1x1s or whatever scrap thin strips of wood you have handy. ( one strip mebbe 12" for the transom and the other strip representing the swim platform..18" ? )
3. at one End put a carriage bolt through Both strips of wood with a thumb screw or nut to tighten it up.
4. put your boat in the water when its completely flat water ( in the ramp would do )
5. Place your make shift "Compass" on the transom and duct tape it secure ( at the level you want your Platform to be ).
6. move your second arm of the compass to be were you want it in relation to the water..then Tighten your wingnut or bolt and nut. Mark your transom with something to keep the placement of the Bottom of your SP ..
There is your custom angle to the transom ( dont disturb your jig now .. ) . secure more if needed .
I would not go side to side angles..just keep the side to side the same level across the transom.
YD.