Can u lag bolt the 4 x4s into the existing structure.? That would definitely carry the weight I would think
apologies for reviving a very, very old thread...
For those of you that a plywood construction, how are your doors holding up? Has the ply warped over time?
I should think if you had a strong enough frame, and thick plywood it should be fine. At least I hope so, because that's how I'm currently building my doors!
