Thank you for all the compliments.
You are correct in guessing aluminum tubes...
I use a dremel to turn neat styrene discs, drill the holes, slightly too small,
and shove the tubes into the holes.
I posted an earlier scale of 1:20, my mistake...
To allow a pilot to actually get inside the craft it is scale 1:24.
To answer the rivet question, I have a rivet tool (Basically a serrated pizza cutter). Doesn't work too well on curvy surfaces though... For that I just use a scribing tool with a blunt point.
The engines - I have stolen and hacked apart all kinds of old electronics, printers,
a broken radio, yada yada to get some parts, tubes etc. Then some styrene to get the shape and a bit of kit-bashing (Looking forward to that...
)