I havent seen the Big Spitfire. I have plans for the Mig15 and the biplane. I put it all on hold 'cause I'm working on some 'big birds' (balsa and monokote) and glow engines (new for me) like the ones most guys fly at the field.
I'm still having some under and over extrusion issues with my (older) printer ... so the finish is not always perfect. Most parts are glued together with some 'chinese glue' (contact cement) ... It makes the joints more visible than with CA.
You will probably maiden your plane before I get to finish mine.
Chris