Arani this is a very nice job on shape ,

Before laminating glass in 4 or 6oz with an longitudinal tread and the second tread like the board slices direction, this last one linking the section of the board to make like a reinforced concrete beam, be sure to scell the foam with resin mixed with microcell, otherwise you can have micro holes sipping patiently water while your are paddling later on

And you will avoid resin to fill the EPS like a sponge and save total weight plus the money's resin save.
As well, to scell valves in the laminate glass BEFORE you fill the laminated glass then sand and later on gloss the board. Leave the ( set at 2 both ends ) valves open to let "breath" the inner board during these last process to avoid the f..... holes