Your boat would be ok to deck within reason. I don't think I'd deck it up to the gunwales but maybe the same height as the seat. In the end, it gets down to how stable your boat is.
I don't know that it would be a great idea. However, it might be worth considering. I decked my v-hull from the front bench forward and it provided more room to store items that weren't needed on the floor. The deck I built is solid and great for lounging aroudn on. But, I'm not sure I'd expect a pedestal seat to be safe up there. It's really up to your boat, you, the people you fish with, and most of all, comfort levels. Your boat might be fine for 2 people to fish with a raised front deck, one person on deck, one in the rear, but you should consider putting a lot of weight (ir battery) very close to the keel line.
Your boat looks like kinda like mine. I have front and rear decks that are bench height. Its is very stable for two people to stand and fish from and sit in the pedistal seats.