Nice, glad he is eating. It won't be long before there will be nothing left to leave in over night. I feed my adults twice a week. Put the food in before work, and once I get home it has been devoured. The PVC tubing is a good idea, it will make it stable. as far as securing the ramp you could probably silicone it on and let it dry overnight, or use something like liquid nail or similar adhesive, then just keep it out of the cage long enough to fully cure.