?? reducing body weight with PVC pipe

I plan to have an outside skin and inside skin of 1/8 oak
and a skeliton support of wood around the parimaders
and drill some shallow holes in top and bottom wood reinforcement scrap
and extend PVC pipe along the middle as reinforcement in the middle of each wall.
this will reduce weight, and cost. allow for wiring and insolation.
I plan to glue the pipe to the walls ( I could rivit them too if needed.
Thoughts
and a skeliton support of wood around the parimaders
and drill some shallow holes in top and bottom wood reinforcement scrap
and extend PVC pipe along the middle as reinforcement in the middle of each wall.

this will reduce weight, and cost. allow for wiring and insolation.
I plan to glue the pipe to the walls ( I could rivit them too if needed.
Thoughts