Hello all, I'm about to reassemble my acclaim 0041 which has previously had the upgrades done to it which makes it like the current model. I dry fit it together to be sure I knew how it went after I broke out the cement. Issue I have is between the stove back and the top plate, and the front and the top plate, there is a gap say 3/8" where the front and back are not in the grove of the top plate. The side plates are snug in the top. I know that the cement in the bottom channel will raise it a bit but I'm thinking the top plate is warped? If I put a straight edge across the top it does crown in the center, is this normal? No other parts show any warpage or signs of abuse, (I bought this thing used). Any input? Thanks!