Platform to bracket layup question

[take a potter]

I had found this picture of a Hermco platform a while back. I thought it was a pretty good shot of everything going on.



I do plan on glassing the front of the platform to the tub. Right now I have 7/16" of glass for a hanger rail at top of the front of the tub as well as around the perimeter where the bolts will go thru. It is about 5" wide. So I'll have plenty of glass at the top to bevel and glass the platform to it.

I was planning on two full height box stringers about 3 1/2" wide, similar in construction as the ones in the boat. Do you think that will be adequate?