Just my opinion and I'm sure you'll get others, but I'd only do this on a 1/2A (.049-ish) size plane at the most. For a "normal" (.40 and up) trainer, I'd use something a bit more solid, like Robart hinge points or even CA hinges.

Hope this helps - can you give details as to the size of the trainer you're talking about?

Regards,

Bob