Quick question before I cut the screen

I ordered a "4'x8'" piece of Wilsonart Designer White laminate today (per recommendation from, well, EVERYONE here). My understanding is this piece comes in with a little more than an inch added to each corner, effectively making it 49"x97". I'm shooting for 100" on my screen. With the added in (49"), I can hit the 49"x87.1" needed for the 100" dimension. Anybody see anything wrong with this, or am I pushing it by not getting the 5'x8' of laminate instead? Help before I cut would be great. Thanks all.