Scratch building some of the finer details:
Navigation lights on the top wing were carved out, followed with a strip of plastic sheet glued to close it up, and sanded flush to the wing shape. Once the aircraft is painted, the hollowed out areas will be filled in with special clear liquid.
The control arms that were added are just hollow brass .3mm size.
Handholds on the wingtop were added, created same way as the lights.
Remaining handholds and foothold were made from the wire of a twist tie. Holes were drilled into the fuselage so the glue had a place to pool, and add some strength - this way the detail isn't just precariously sitting on the surface.
regards,
Jack