REA Liner requires lamination of fuselage sides and inner sides of engine pods, otherwise they would buckle when wings are being glued on. Outer winglets are not so critical, but a little stiffening does no harm. I'd recommend to attach the front landing leg as the very last thing because fuselage bottom is in the same plane as front halves of engine pods; it helps to be able to put the model on a table during assembly:
Otherwise a troublefree build. Looking at the finished model, I think the nozzles in inner wing trailing edges are drawn vertical and Orca misses an airlock in the central bow, but those are just graphic details with no impact on assembly.