Good luck with your project.
Here is my porta jack.
I can jack the engine so high underway that my engine comes out of the water and I loose control...
Combined with the engine trim, I can tilt the power head inside the cockpit which is great if you have a mechanical problem, which unfortuneatly I did everytime I went out this summer.
Hydraulic bracket worked flawlessly though.
I thought a fiberglass bracket would look better, but after installing it, the scissor jack is very cool looking.
I would recommend a swim platform regardless of whatever bracket you go with.