RE: OMG!Just bought a Expresscraft Thunderbolt!
There's another guy on here that bought a T-bolt from them. I didn't know they sold knock offs. Mine's gone. I stuffed it at 50 and it folded like an accordion. I would highly recommend adding a bulkhead and maybe a little CF cloth. It's a very light weight hull and if you stuff it with any speed, there is going to be significant damage unless they changed the layup.
Here's a pic of the inside.