Refoaming question

[superjetincairns]

So I'm refoaming my superjet and installing footholds.
I've seen a few posts where people have used pieces of styrofoam or other preformed sheets cut up and stacked inside the hull. I was intending to do this and then pour 2 part foam over it to lock it all together and glass over it.
Does this compromise the strength of the hull at all? It seems that the 2 part foam would add a fair amount of strength being stuck to the inside of the hull etc. any opinions?

 

[Yami-Rider]

The 2 part foam adds a little bit of strength, when your all done fiberglassing, pour 2-part foam into the tray from the top of the gunwales, then glass shut.