I started working in the forward cabin area. This included the floor, stiffeners, and seat assemblies. I began to install the sliding seat assemblies and found out the hard way that I should not have started this stage yet due to the sub-assembly not being together and square. The old saying goes, there is always time to do the job a second time, but never enough time to do it right the first time. Well, there it is. I have reordered the parts that I messed up and will continue to move through the build. this time ensuring the front cabin is square and straight. I will then move forward to attaching the cabin sub-assembly to the rear fuselage and then move to install the sliding seats at the appropriate time.