This is my first kit.I am building the Marquam Hill Mansion with no problems until now...The tower! I meticulously cut all the molding pieces, glued the pieces into the columns. somehow I am about 3/4" off from it fitting around the hexagon floor properly. Re-checked the directions, pieces and measurements for the 50th time ughhhh! Everything is perfect. Can't figure it out Ughhh! Not sure if anyone here can help, I figure it's worth a shot. Thanks in advance