I've put together 17 of the CA / CCs, 10 DNGs, 11 BCs, and scads of NCA / NCL / DW / CL / FF.
And played over 100 games with them... including a convention free-for-all.
To date, I've had exactly ZERO saucers break off... and exactly ZERO nacelles break off.
When I assemble them, I use what I've come to refer to as the "Two-Glue" method.
Here's the run-down.
The "two-glue" method is actually quite simple, and works really well on the ST2500 Klingons.
Sand, clean, prep both sides of joint...
Mix a high-strength, slow-set, 2-part epoxy...
Apply epoxy to middle 75 - 80% of joint...
Using a toothpick, apply superglue to the outer 10% of each side of joint...
Assemble and hold in place...
The super glue will set relatively quickly, allowing you to set the piece aside and move onto another miniature. This enables the epoxy to slowly cure out and form a high-strength bond.