I currently have the first rocket I ever built. It was scratch built and is 2.6" in diameter, 39.9 inches long, has a PML plastic nose cone, 1/4" launch lugs, 29mm motor mount, PML piston for recovery and used four Aerotech Astrobee D plastic fins. It is currently in need of a new paint job but still around after 24 years. I also have a few Adept altimeters and timers with the oldest being an ALTS82-50K octagonal flat mount altimeter which actually used string to tie the battery down.