For a continuous color deck and bottom make a "master batch" of resin with the color in it.
Pour half into a clean container and put a lid on it.
Mix the hardener in the first bucket of resin and laminate the bottom - 1 layer of glass. Cut lap that on the deck.
Then mix hardener in the second color resin bucket and laminate the deck - 1 later. Cut that at the bottom cut lap.
Then laminate the bottom clear free lap - sand the lap flush with deck
Then laminate the deck clear free lap - sand the lap flush with bottom